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 <pre id='vimCodeElement'>
-<a name="L1"></a><span id="L1" class="LineNr">  1 </span><span class="SalientComment">## clicking on the code typed into a sandbox toggles its trace</span>
-<a name="L2"></a><span id="L2" class="LineNr">  2 </span>
-<a name="L3"></a><span id="L3" class="LineNr">  3 </span><span class="muScenario">scenario</span> sandbox-click-on-code-toggles-app-trace [
-<a name="L4"></a><span id="L4" class="LineNr">  4 </span>  <span class="Constant">local-scope</span>
-<a name="L5"></a><span id="L5" class="LineNr">  5 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<a name="L6"></a><span id="L6" class="LineNr">  6 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<a name="L7"></a><span id="L7" class="LineNr">  7 </span>  <span class="Comment"># basic recipe</span>
-<a name="L8"></a><span id="L8" class="LineNr">  8 </span>  assume-resources [
-<a name="L9"></a><span id="L9" class="LineNr">  9 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<a name="L10"></a><span id="L10" class="LineNr"> 10 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<a name="L11"></a><span id="L11" class="LineNr"> 11 </span><span class="Constant">      |  stash [abc]</span>|
-<a name="L12"></a><span id="L12" class="LineNr"> 12 </span><span class="Constant">      |]|</span>
-<a name="L13"></a><span id="L13" class="LineNr"> 13 </span>    ]
-<a name="L14"></a><span id="L14" class="LineNr"> 14 </span>  ]
-<a name="L15"></a><span id="L15" class="LineNr"> 15 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[foo]</span>
-<a name="L16"></a><span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># run it</span>
-<a name="L17"></a><span id="L17" class="LineNr"> 17 </span>  assume-console [
-<a name="L18"></a><span id="L18" class="LineNr"> 18 </span>    press F4
-<a name="L19"></a><span id="L19" class="LineNr"> 19 </span>  ]
-<a name="L20"></a><span id="L20" class="LineNr"> 20 </span>  event-loop screen, console, env, resources
-<a name="L21"></a><span id="L21" class="LineNr"> 21 </span>  screen-should-contain [
-<a name="L22"></a><span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L23"></a><span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<a name="L24"></a><span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<a name="L25"></a><span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<a name="L26"></a><span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<a name="L27"></a><span id="L27" class="LineNr"> 27 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<a name="L28"></a><span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L29"></a><span id="L29" class="LineNr"> 29 </span>  ]
-<a name="L30"></a><span id="L30" class="LineNr"> 30 </span>  <span class="Comment"># click on the code in the sandbox</span>
-<a name="L31"></a><span id="L31" class="LineNr"> 31 </span>  assume-console [
-<a name="L32"></a><span id="L32" class="LineNr"> 32 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
-<a name="L33"></a><span id="L33" class="LineNr"> 33 </span>  ]
-<a name="L34"></a><span id="L34" class="LineNr"> 34 </span>  run [
-<a name="L35"></a><span id="L35" class="LineNr"> 35 </span>    event-loop screen, console, env, resources
-<a name="L36"></a><span id="L36" class="LineNr"> 36 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<a name="L37"></a><span id="L37" class="LineNr"> 37 </span>    print screen, cursor
-<a name="L38"></a><span id="L38" class="LineNr"> 38 </span>  ]
-<a name="L39"></a><span id="L39" class="LineNr"> 39 </span>  <span class="Comment"># trace now printed and cursor shouldn't have budged</span>
-<a name="L40"></a><span id="L40" class="LineNr"> 40 </span>  screen-should-contain [
-<a name="L41"></a><span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L42"></a><span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
-<a name="L43"></a><span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<a name="L44"></a><span id="L44" class="LineNr"> 44 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<a name="L45"></a><span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<a name="L46"></a><span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
-<a name="L47"></a><span id="L47" class="LineNr"> 47 </span>  ]
-<a name="L48"></a><span id="L48" class="LineNr"> 48 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
-<a name="L49"></a><span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .                                                                                                    .</span>
-<a name="L50"></a><span id="L50" class="LineNr"> 50 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L51"></a><span id="L51" class="LineNr"> 51 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<a name="L52"></a><span id="L52" class="LineNr"> 52 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L53"></a><span id="L53" class="LineNr"> 53 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L54"></a><span id="L54" class="LineNr"> 54 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
-<a name="L55"></a><span id="L55" class="LineNr"> 55 </span>  ]
-<a name="L56"></a><span id="L56" class="LineNr"> 56 </span>  <span class="Comment"># click again on the same region</span>
-<a name="L57"></a><span id="L57" class="LineNr"> 57 </span>  assume-console [
-<a name="L58"></a><span id="L58" class="LineNr"> 58 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
-<a name="L59"></a><span id="L59" class="LineNr"> 59 </span>  ]
-<a name="L60"></a><span id="L60" class="LineNr"> 60 </span>  run [
-<a name="L61"></a><span id="L61" class="LineNr"> 61 </span>    event-loop screen, console, env, resources
-<a name="L62"></a><span id="L62" class="LineNr"> 62 </span>    print screen, cursor
-<a name="L63"></a><span id="L63" class="LineNr"> 63 </span>  ]
-<a name="L64"></a><span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># trace hidden again</span>
-<a name="L65"></a><span id="L65" class="LineNr"> 65 </span>  screen-should-contain [
-<a name="L66"></a><span id="L66" class="LineNr"> 66 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L67"></a><span id="L67" class="LineNr"> 67 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
-<a name="L68"></a><span id="L68" class="LineNr"> 68 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<a name="L69"></a><span id="L69" class="LineNr"> 69 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<a name="L70"></a><span id="L70" class="LineNr"> 70 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<a name="L71"></a><span id="L71" class="LineNr"> 71 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<a name="L72"></a><span id="L72" class="LineNr"> 72 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L73"></a><span id="L73" class="LineNr"> 73 </span>  ]
-<a name="L74"></a><span id="L74" class="LineNr"> 74 </span>]
-<a name="L75"></a><span id="L75" class="LineNr"> 75 </span>
-<a name="L76"></a><span id="L76" class="LineNr"> 76 </span><span class="muScenario">scenario</span> sandbox-shows-app-trace-and-result [
-<a name="L77"></a><span id="L77" class="LineNr"> 77 </span>  <span class="Constant">local-scope</span>
-<a name="L78"></a><span id="L78" class="LineNr"> 78 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<a name="L79"></a><span id="L79" class="LineNr"> 79 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<a name="L80"></a><span id="L80" class="LineNr"> 80 </span>  <span class="Comment"># basic recipe</span>
-<a name="L81"></a><span id="L81" class="LineNr"> 81 </span>  assume-resources [
-<a name="L82"></a><span id="L82" class="LineNr"> 82 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<a name="L83"></a><span id="L83" class="LineNr"> 83 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<a name="L84"></a><span id="L84" class="LineNr"> 84 </span><span class="Constant">      |  stash [abc]</span>|
-<a name="L85"></a><span id="L85" class="LineNr"> 85 </span>      <span class="Constant">|</span>  <span class="muControl">reply</span> 4|
-<a name="L86"></a><span id="L86" class="LineNr"> 86 </span><span class="Constant">      |]|</span>
-<a name="L87"></a><span id="L87" class="LineNr"> 87 </span>    ]
-<a name="L88"></a><span id="L88" class="LineNr"> 88 </span>  ]
-<a name="L89"></a><span id="L89" class="LineNr"> 89 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[foo]</span>
-<a name="L90"></a><span id="L90" class="LineNr"> 90 </span>  <span class="Comment"># run it</span>
-<a name="L91"></a><span id="L91" class="LineNr"> 91 </span>  assume-console [
-<a name="L92"></a><span id="L92" class="LineNr"> 92 </span>    press F4
-<a name="L93"></a><span id="L93" class="LineNr"> 93 </span>  ]
-<a name="L94"></a><span id="L94" class="LineNr"> 94 </span>  event-loop screen, console, env, resources
-<a name="L95"></a><span id="L95" class="LineNr"> 95 </span>  screen-should-contain [
-<a name="L96"></a><span id="L96" class="LineNr"> 96 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L97"></a><span id="L97" class="LineNr"> 97 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<a name="L98"></a><span id="L98" class="LineNr"> 98 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<a name="L99"></a><span id="L99" class="LineNr"> 99 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
-<a name="L100"></a><span id="L100" class="LineNr">100 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
-<a name="L101"></a><span id="L101" class="LineNr">101 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<a name="L102"></a><span id="L102" class="LineNr">102 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<a name="L103"></a><span id="L103" class="LineNr">103 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L104"></a><span id="L104" class="LineNr">104 </span>  ]
-<a name="L105"></a><span id="L105" class="LineNr">105 </span>  <span class="Comment"># click on the code in the sandbox</span>
-<a name="L106"></a><span id="L106" class="LineNr">106 </span>  assume-console [
-<a name="L107"></a><span id="L107" class="LineNr">107 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
-<a name="L108"></a><span id="L108" class="LineNr">108 </span>  ]
-<a name="L109"></a><span id="L109" class="LineNr">109 </span>  run [
-<a name="L110"></a><span id="L110" class="LineNr">110 </span>    event-loop screen, console, env, resources
-<a name="L111"></a><span id="L111" class="LineNr">111 </span>  ]
-<a name="L112"></a><span id="L112" class="LineNr">112 </span>  <span class="Comment"># trace now printed above result</span>
-<a name="L113"></a><span id="L113" class="LineNr">113 </span>  screen-should-contain [
-<a name="L114"></a><span id="L114" class="LineNr">114 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L115"></a><span id="L115" class="LineNr">115 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<a name="L116"></a><span id="L116" class="LineNr">116 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<a name="L117"></a><span id="L117" class="LineNr">117 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
-<a name="L118"></a><span id="L118" class="LineNr">118 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
-<a name="L119"></a><span id="L119" class="LineNr">119 </span>   <span class="Constant"> .                                                  ╎abc                                              .</span>
-<a name="L120"></a><span id="L120" class="LineNr">120 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎8 instructions run                               .</span>
-<a name="L121"></a><span id="L121" class="LineNr">121 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<a name="L122"></a><span id="L122" class="LineNr">122 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<a name="L123"></a><span id="L123" class="LineNr">123 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L124"></a><span id="L124" class="LineNr">124 </span>  ]
-<a name="L125"></a><span id="L125" class="LineNr">125 </span>]
-<a name="L126"></a><span id="L126" class="LineNr">126 </span>
-<a name="L127"></a><span id="L127" class="LineNr">127 </span><span class="muScenario">scenario</span> clicking-on-app-trace-does-nothing [
-<a name="L128"></a><span id="L128" class="LineNr">128 </span>  <span class="Constant">local-scope</span>
-<a name="L129"></a><span id="L129" class="LineNr">129 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<a name="L130"></a><span id="L130" class="LineNr">130 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<a name="L131"></a><span id="L131" class="LineNr">131 </span>  assume-resources [
-<a name="L132"></a><span id="L132" class="LineNr">132 </span>  ]
-<a name="L133"></a><span id="L133" class="LineNr">133 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[stash 123456789]</span>
-<a name="L134"></a><span id="L134" class="LineNr">134 </span>  <span class="Comment"># create and expand the trace</span>
-<a name="L135"></a><span id="L135" class="LineNr">135 </span>  assume-console [
-<a name="L136"></a><span id="L136" class="LineNr">136 </span>    press F4
-<a name="L137"></a><span id="L137" class="LineNr">137 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
-<a name="L138"></a><span id="L138" class="LineNr">138 </span>  ]
-<a name="L139"></a><span id="L139" class="LineNr">139 </span>  event-loop screen, console, env, resources
-<a name="L140"></a><span id="L140" class="LineNr">140 </span>  screen-should-contain [
-<a name="L141"></a><span id="L141" class="LineNr">141 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L142"></a><span id="L142" class="LineNr">142 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L143"></a><span id="L143" class="LineNr">143 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<a name="L144"></a><span id="L144" class="LineNr">144 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<a name="L145"></a><span id="L145" class="LineNr">145 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
-<a name="L146"></a><span id="L146" class="LineNr">146 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
-<a name="L147"></a><span id="L147" class="LineNr">147 </span>  ]
-<a name="L148"></a><span id="L148" class="LineNr">148 </span>  <span class="Comment"># click on the stash under the edit-button region (or any of the other buttons, really)</span>
-<a name="L149"></a><span id="L149" class="LineNr">149 </span>  assume-console [
-<a name="L150"></a><span id="L150" class="LineNr">150 </span>    left-click<span class="Constant"> 5</span>,<span class="Constant"> 57</span>
-<a name="L151"></a><span id="L151" class="LineNr">151 </span>  ]
-<a name="L152"></a><span id="L152" class="LineNr">152 </span>  run [
-<a name="L153"></a><span id="L153" class="LineNr">153 </span>    event-loop screen, console, env, resources
-<a name="L154"></a><span id="L154" class="LineNr">154 </span>  ]
-<a name="L155"></a><span id="L155" class="LineNr">155 </span>  <span class="Comment"># no change; doesn't die</span>
-<a name="L156"></a><span id="L156" class="LineNr">156 </span>  screen-should-contain [
-<a name="L157"></a><span id="L157" class="LineNr">157 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<a name="L158"></a><span id="L158" class="LineNr">158 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<a name="L159"></a><span id="L159" class="LineNr">159 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<a name="L160"></a><span id="L160" class="LineNr">160 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<a name="L161"></a><span id="L161" class="LineNr">161 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
-<a name="L162"></a><span id="L162" class="LineNr">162 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
-<a name="L163"></a><span id="L163" class="LineNr">163 </span>  ]
-<a name="L164"></a><span id="L164" class="LineNr">164 </span>]
-<a name="L165"></a><span id="L165" class="LineNr">165 </span>
-<a name="L166"></a><span id="L166" class="LineNr">166 </span><span class="muData">container</span> sandbox [
-<a name="L167"></a><span id="L167" class="LineNr">167 </span>  trace:text
-<a name="L168"></a><span id="L168" class="LineNr">168 </span>  display-trace?:bool
-<a name="L169"></a><span id="L169" class="LineNr">169 </span>]
-<a name="L170"></a><span id="L170" class="LineNr">170 </span>
-<a name="L171"></a><span id="L171" class="LineNr">171 </span><span class="Comment"># replaced in a later layer</span>
-<a name="L172"></a><span id="L172" class="LineNr">172 </span><span class="muRecipe">def!</span> update-sandbox sandbox:&amp;:sandbox, env:&amp;:environment, idx:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox, env:&amp;:environment [
-<a name="L173"></a><span id="L173" class="LineNr">173 </span>  <span class="Constant">local-scope</span>
-<a name="L174"></a><span id="L174" class="LineNr">174 </span>  <span class="Constant">load-ingredients</span>
-<a name="L175"></a><span id="L175" class="LineNr">175 </span>  data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
-<a name="L176"></a><span id="L176" class="LineNr">176 </span>  response:text, _, fake-screen:&amp;:screen, trace:text <span class="Special">&lt;-</span> run-sandboxed data
-<a name="L177"></a><span id="L177" class="LineNr">177 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response:offset</span>, response
-<a name="L178"></a><span id="L178" class="LineNr">178 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
-<a name="L179"></a><span id="L179" class="LineNr">179 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">trace:offset</span>, trace
-<a name="L180"></a><span id="L180" class="LineNr">180 </span>]
-<a name="L181"></a><span id="L181" class="LineNr">181 </span>
-<a name="L182"></a><span id="L182" class="LineNr">182 </span><span class="Comment"># clicks on sandbox code toggle its display-trace? flag</span>
-<a name="L183"></a><span id="L183" class="LineNr">183 </span><span class="muRecipe">after</span> <span class="Constant">&lt;global-touch&gt;</span> [
-<a name="L184"></a><span id="L184" class="LineNr">184 </span>  <span class="Comment"># check if it's inside the code of any sandbox</span>
-<a name="L185"></a><span id="L185" class="LineNr">185 </span>  <span class="Delimiter">{</span>
-<a name="L186"></a><span id="L186" class="LineNr">186 </span>    sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<a name="L187"></a><span id="L187" class="LineNr">187 </span>    click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
-<a name="L188"></a><span id="L188" class="LineNr">188 </span>    on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
-<a name="L189"></a><span id="L189" class="LineNr">189 </span>    <span class="muControl">break-unless</span> on-sandbox-side?
-<a name="L190"></a><span id="L190" class="LineNr">190 </span>    first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<a name="L191"></a><span id="L191" class="LineNr">191 </span>    <span class="muControl">break-unless</span> first-sandbox
-<a name="L192"></a><span id="L192" class="LineNr">192 </span>    first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<a name="L193"></a><span id="L193" class="LineNr">193 </span>    click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
-<a name="L194"></a><span id="L194" class="LineNr">194 </span>    below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
-<a name="L195"></a><span id="L195" class="LineNr">195 </span>    <span class="muControl">break-unless</span> below-sandbox-editor?
-<a name="L196"></a><span id="L196" class="LineNr">196 </span>    <span class="Comment"># identify the sandbox whose code is being clicked on</span>
-<a name="L197"></a><span id="L197" class="LineNr">197 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> find-click-in-sandbox-code env, click-row
-<a name="L198"></a><span id="L198" class="LineNr">198 </span>    <span class="muControl">break-unless</span> sandbox
-<a name="L199"></a><span id="L199" class="LineNr">199 </span>    <span class="Comment"># toggle its display-trace? property</span>
-<a name="L200"></a><span id="L200" class="LineNr">200 </span>    x:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
-<a name="L201"></a><span id="L201" class="LineNr">201 </span>    x <span class="Special">&lt;-</span> not x
-<a name="L202"></a><span id="L202" class="LineNr">202 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">display-trace?:offset</span>, x
-<a name="L203"></a><span id="L203" class="LineNr">203 </span>    hide-screen screen
-<a name="L204"></a><span id="L204" class="LineNr">204 </span>    screen <span class="Special">&lt;-</span> render-sandbox-side screen, env, render
-<a name="L205"></a><span id="L205" class="LineNr">205 </span>    screen <span class="Special">&lt;-</span> update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
-<a name="L206"></a><span id="L206" class="LineNr">206 </span>    <span class="Comment"># no change in cursor</span>
-<a name="L207"></a><span id="L207" class="LineNr">207 </span>    show-screen screen
-<a name="L208"></a><span id="L208" class="LineNr">208 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
-<a name="L209"></a><span id="L209" class="LineNr">209 </span>  <span class="Delimiter">}</span>
-<a name="L210"></a><span id="L210" class="LineNr">210 </span>]
-<a name="L211"></a><span id="L211" class="LineNr">211 </span>
-<a name="L212"></a><span id="L212" class="LineNr">212 </span><span class="muRecipe">def</span> find-click-in-sandbox-code env:&amp;:environment, click-row:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox [
-<a name="L213"></a><span id="L213" class="LineNr">213 </span>  <span class="Constant">local-scope</span>
-<a name="L214"></a><span id="L214" class="LineNr">214 </span>  <span class="Constant">load-ingredients</span>
-<a name="L215"></a><span id="L215" class="LineNr">215 </span>  <span class="Comment"># assert click-row &gt;= sandbox.starting-row-on-screen</span>
-<a name="L216"></a><span id="L216" class="LineNr">216 </span>  sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<a name="L217"></a><span id="L217" class="LineNr">217 </span>  start:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<a name="L218"></a><span id="L218" class="LineNr">218 </span>  clicked-on-sandboxes?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, start
-<a name="L219"></a><span id="L219" class="LineNr">219 </span>  assert clicked-on-sandboxes?, <span class="Constant">[extract-sandbox called on click to sandbox editor]</span>
-<a name="L220"></a><span id="L220" class="LineNr">220 </span>  <span class="Comment"># while click-row &lt; sandbox.next-sandbox.starting-row-on-screen</span>
-<a name="L221"></a><span id="L221" class="LineNr">221 </span>  <span class="Delimiter">{</span>
-<a name="L222"></a><span id="L222" class="LineNr">222 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
-<a name="L223"></a><span id="L223" class="LineNr">223 </span>    <span class="muControl">break-unless</span> next-sandbox
-<a name="L224"></a><span id="L224" class="LineNr">224 </span>    next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<a name="L225"></a><span id="L225" class="LineNr">225 </span>    found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
-<a name="L226"></a><span id="L226" class="LineNr">226 </span>    <span class="muControl">break-if</span> found?
-<a name="L227"></a><span id="L227" class="LineNr">227 </span>    sandbox <span class="Special">&lt;-</span> copy next-sandbox
-<a name="L228"></a><span id="L228" class="LineNr">228 </span>    <span class="muControl">loop</span>
-<a name="L229"></a><span id="L229" class="LineNr">229 </span>  <span class="Delimiter">}</span>
-<a name="L230"></a><span id="L230" class="LineNr">230 </span>  <span class="Comment"># return sandbox if click is in its code region</span>
-<a name="L231"></a><span id="L231" class="LineNr">231 </span>  code-ending-row:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>
-<a name="L232"></a><span id="L232" class="LineNr">232 </span>  click-above-response?:bool <span class="Special">&lt;-</span> lesser-than click-row, code-ending-row
-<a name="L233"></a><span id="L233" class="LineNr">233 </span>  start:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<a name="L234"></a><span id="L234" class="LineNr">234 </span>  click-below-menu?:bool <span class="Special">&lt;-</span> greater-than click-row, start
-<a name="L235"></a><span id="L235" class="LineNr">235 </span>  click-on-sandbox-code?:bool <span class="Special">&lt;-</span> and click-above-response?, click-below-menu?
-<a name="L236"></a><span id="L236" class="LineNr">236 </span>  <span class="Delimiter">{</span>
-<a name="L237"></a><span id="L237" class="LineNr">237 </span>    <span class="muControl">break-if</span> click-on-sandbox-code?
-<a name="L238"></a><span id="L238" class="LineNr">238 </span>    <span class="muControl">return</span> <span class="Constant">0/no-click-in-sandbox-output</span>
-<a name="L239"></a><span id="L239" class="LineNr">239 </span>  <span class="Delimiter">}</span>
-<a name="L240"></a><span id="L240" class="LineNr">240 </span>  <span class="muControl">return</span> sandbox
-<a name="L241"></a><span id="L241" class="LineNr">241 </span>]
-<a name="L242"></a><span id="L242" class="LineNr">242 </span>
-<a name="L243"></a><span id="L243" class="LineNr">243 </span><span class="Comment"># when rendering a sandbox, dump its trace before response/warning if display-trace? property is set</span>
-<a name="L244"></a><span id="L244" class="LineNr">244 </span><span class="muRecipe">after</span> <span class="Constant">&lt;render-sandbox-results&gt;</span> [
-<a name="L245"></a><span id="L245" class="LineNr">245 </span>  <span class="Delimiter">{</span>
-<a name="L246"></a><span id="L246" class="LineNr">246 </span>    display-trace?:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
-<a name="L247"></a><span id="L247" class="LineNr">247 </span>    <span class="muControl">break-unless</span> display-trace?
-<a name="L248"></a><span id="L248" class="LineNr">248 </span>    sandbox-trace:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">trace:offset</span>
-<a name="L249"></a><span id="L249" class="LineNr">249 </span>    <span class="muControl">break-unless</span> sandbox-trace  <span class="Comment"># nothing to print; move on</span>
-<a name="L250"></a><span id="L250" class="LineNr">250 </span>    row, screen <span class="Special">&lt;-</span> render-text screen, sandbox-trace, left, right, <span class="Constant">245/grey</span>, row
-<a name="L251"></a><span id="L251" class="LineNr">251 </span>  <span class="Delimiter">}</span>
-<a name="L252"></a><span id="L252" class="LineNr">252 </span><span class="Constant">  &lt;render-sandbox-trace-done&gt;</span>
-<a name="L253"></a><span id="L253" class="LineNr">253 </span>]
+<span id="L1" class="LineNr">  1 </span><span class="SalientComment">## clicking on the code typed into a sandbox toggles its trace</span>
+<span id="L2" class="LineNr">  2 </span>
+<span id="L3" class="LineNr">  3 </span><span class="muScenario">scenario</span> sandbox-click-on-code-toggles-app-trace [
+<span id="L4" class="LineNr">  4 </span>  <span class="Constant">local-scope</span>
+<span id="L5" class="LineNr">  5 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L6" class="LineNr">  6 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L7" class="LineNr">  7 </span>  <span class="Comment"># basic recipe</span>
+<span id="L8" class="LineNr">  8 </span>  assume-resources [
+<span id="L9" class="LineNr">  9 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L10" class="LineNr"> 10 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L11" class="LineNr"> 11 </span><span class="Constant">      |  stash [abc]</span>|
+<span id="L12" class="LineNr"> 12 </span><span class="Constant">      |]|</span>
+<span id="L13" class="LineNr"> 13 </span>    ]
+<span id="L14" class="LineNr"> 14 </span>  ]
+<span id="L15" class="LineNr"> 15 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[foo]</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># run it</span>
+<span id="L17" class="LineNr"> 17 </span>  assume-console [
+<span id="L18" class="LineNr"> 18 </span>    press F4
+<span id="L19" class="LineNr"> 19 </span>  ]
+<span id="L20" class="LineNr"> 20 </span>  event-loop screen, console, env, resources
+<span id="L21" class="LineNr"> 21 </span>  screen-should-contain [
+<span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L27" class="LineNr"> 27 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L29" class="LineNr"> 29 </span>  ]
+<span id="L30" class="LineNr"> 30 </span>  <span class="Comment"># click on the code in the sandbox</span>
+<span id="L31" class="LineNr"> 31 </span>  assume-console [
+<span id="L32" class="LineNr"> 32 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L33" class="LineNr"> 33 </span>  ]
+<span id="L34" class="LineNr"> 34 </span>  run [
+<span id="L35" class="LineNr"> 35 </span>    event-loop screen, console, env, resources
+<span id="L36" class="LineNr"> 36 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L37" class="LineNr"> 37 </span>    print screen, cursor
+<span id="L38" class="LineNr"> 38 </span>  ]
+<span id="L39" class="LineNr"> 39 </span>  <span class="Comment"># trace now printed and cursor shouldn't have budged</span>
+<span id="L40" class="LineNr"> 40 </span>  screen-should-contain [
+<span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
+<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L44" class="LineNr"> 44 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
+<span id="L47" class="LineNr"> 47 </span>  ]
+<span id="L48" class="LineNr"> 48 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
+<span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L50" class="LineNr"> 50 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L51" class="LineNr"> 51 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L52" class="LineNr"> 52 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L53" class="LineNr"> 53 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L54" class="LineNr"> 54 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
+<span id="L55" class="LineNr"> 55 </span>  ]
+<span id="L56" class="LineNr"> 56 </span>  <span class="Comment"># click again on the same region</span>
+<span id="L57" class="LineNr"> 57 </span>  assume-console [
+<span id="L58" class="LineNr"> 58 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
+<span id="L59" class="LineNr"> 59 </span>  ]
+<span id="L60" class="LineNr"> 60 </span>  run [
+<span id="L61" class="LineNr"> 61 </span>    event-loop screen, console, env, resources
+<span id="L62" class="LineNr"> 62 </span>    print screen, cursor
+<span id="L63" class="LineNr"> 63 </span>  ]
+<span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># trace hidden again</span>
+<span id="L65" class="LineNr"> 65 </span>  screen-should-contain [
+<span id="L66" class="LineNr"> 66 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L67" class="LineNr"> 67 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
+<span id="L68" class="LineNr"> 68 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L69" class="LineNr"> 69 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L70" class="LineNr"> 70 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L71" class="LineNr"> 71 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L72" class="LineNr"> 72 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L73" class="LineNr"> 73 </span>  ]
+<span id="L74" class="LineNr"> 74 </span>]
+<span id="L75" class="LineNr"> 75 </span>
+<span id="L76" class="LineNr"> 76 </span><span class="muScenario">scenario</span> sandbox-shows-app-trace-and-result [
+<span id="L77" class="LineNr"> 77 </span>  <span class="Constant">local-scope</span>
+<span id="L78" class="LineNr"> 78 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L79" class="LineNr"> 79 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Comment"># basic recipe</span>
+<span id="L81" class="LineNr"> 81 </span>  assume-resources [
+<span id="L82" class="LineNr"> 82 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L83" class="LineNr"> 83 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L84" class="LineNr"> 84 </span><span class="Constant">      |  stash [abc]</span>|
+<span id="L85" class="LineNr"> 85 </span>      <span class="Constant">|</span>  <span class="muControl">reply</span> 4|
+<span id="L86" class="LineNr"> 86 </span><span class="Constant">      |]|</span>
+<span id="L87" class="LineNr"> 87 </span>    ]
+<span id="L88" class="LineNr"> 88 </span>  ]
+<span id="L89" class="LineNr"> 89 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[foo]</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Comment"># run it</span>
+<span id="L91" class="LineNr"> 91 </span>  assume-console [
+<span id="L92" class="LineNr"> 92 </span>    press F4
+<span id="L93" class="LineNr"> 93 </span>  ]
+<span id="L94" class="LineNr"> 94 </span>  event-loop screen, console, env, resources
+<span id="L95" class="LineNr"> 95 </span>  screen-should-contain [
+<span id="L96" class="LineNr"> 96 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L97" class="LineNr"> 97 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L98" class="LineNr"> 98 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L99" class="LineNr"> 99 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
+<span id="L100" class="LineNr">100 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
+<span id="L101" class="LineNr">101 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L102" class="LineNr">102 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L103" class="LineNr">103 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L104" class="LineNr">104 </span>  ]
+<span id="L105" class="LineNr">105 </span>  <span class="Comment"># click on the code in the sandbox</span>
+<span id="L106" class="LineNr">106 </span>  assume-console [
+<span id="L107" class="LineNr">107 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L108" class="LineNr">108 </span>  ]
+<span id="L109" class="LineNr">109 </span>  run [
+<span id="L110" class="LineNr">110 </span>    event-loop screen, console, env, resources
+<span id="L111" class="LineNr">111 </span>  ]
+<span id="L112" class="LineNr">112 </span>  <span class="Comment"># trace now printed above result</span>
+<span id="L113" class="LineNr">113 </span>  screen-should-contain [
+<span id="L114" class="LineNr">114 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L115" class="LineNr">115 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L116" class="LineNr">116 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L117" class="LineNr">117 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
+<span id="L118" class="LineNr">118 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
+<span id="L119" class="LineNr">119 </span>   <span class="Constant"> .                                                  ╎abc                                              .</span>
+<span id="L120" class="LineNr">120 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎8 instructions run                               .</span>
+<span id="L121" class="LineNr">121 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L122" class="LineNr">122 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L123" class="LineNr">123 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L124" class="LineNr">124 </span>  ]
+<span id="L125" class="LineNr">125 </span>]
+<span id="L126" class="LineNr">126 </span>
+<span id="L127" class="LineNr">127 </span><span class="muScenario">scenario</span> clicking-on-app-trace-does-nothing [
+<span id="L128" class="LineNr">128 </span>  <span class="Constant">local-scope</span>
+<span id="L129" class="LineNr">129 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L130" class="LineNr">130 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L131" class="LineNr">131 </span>  assume-resources [
+<span id="L132" class="LineNr">132 </span>  ]
+<span id="L133" class="LineNr">133 </span>  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment resources, screen, <span class="Constant">[stash 123456789]</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Comment"># create and expand the trace</span>
+<span id="L135" class="LineNr">135 </span>  assume-console [
+<span id="L136" class="LineNr">136 </span>    press F4
+<span id="L137" class="LineNr">137 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L138" class="LineNr">138 </span>  ]
+<span id="L139" class="LineNr">139 </span>  event-loop screen, console, env, resources
+<span id="L140" class="LineNr">140 </span>  screen-should-contain [
+<span id="L141" class="LineNr">141 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L142" class="LineNr">142 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L143" class="LineNr">143 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L144" class="LineNr">144 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L145" class="LineNr">145 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
+<span id="L146" class="LineNr">146 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
+<span id="L147" class="LineNr">147 </span>  ]
+<span id="L148" class="LineNr">148 </span>  <span class="Comment"># click on the stash under the edit-button region (or any of the other buttons, really)</span>
+<span id="L149" class="LineNr">149 </span>  assume-console [
+<span id="L150" class="LineNr">150 </span>    left-click<span class="Constant"> 5</span>,<span class="Constant"> 57</span>
+<span id="L151" class="LineNr">151 </span>  ]
+<span id="L152" class="LineNr">152 </span>  run [
+<span id="L153" class="LineNr">153 </span>    event-loop screen, console, env, resources
+<span id="L154" class="LineNr">154 </span>  ]
+<span id="L155" class="LineNr">155 </span>  <span class="Comment"># no change; doesn't die</span>
+<span id="L156" class="LineNr">156 </span>  screen-should-contain [
+<span id="L157" class="LineNr">157 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L158" class="LineNr">158 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L159" class="LineNr">159 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L160" class="LineNr">160 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L161" class="LineNr">161 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
+<span id="L162" class="LineNr">162 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
+<span id="L163" class="LineNr">163 </span>  ]
+<span id="L164" class="LineNr">164 </span>]
+<span id="L165" class="LineNr">165 </span>
+<span id="L166" class="LineNr">166 </span><span class="muData">container</span> sandbox [
+<span id="L167" class="LineNr">167 </span>  trace:text
+<span id="L168" class="LineNr">168 </span>  display-trace?:bool
+<span id="L169" class="LineNr">169 </span>]
+<span id="L170" class="LineNr">170 </span>
+<span id="L171" class="LineNr">171 </span><span class="Comment"># replaced in a later layer</span>
+<span id="L172" class="LineNr">172 </span><span class="muRecipe">def!</span> update-sandbox sandbox:&amp;:sandbox, env:&amp;:environment, idx:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox, env:&amp;:environment [
+<span id="L173" class="LineNr">173 </span>  <span class="Constant">local-scope</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Constant">load-ingredients</span>
+<span id="L175" class="LineNr">175 </span>  data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
+<span id="L176" class="LineNr">176 </span>  response:text, _, fake-screen:&amp;:screen, trace:text <span class="Special">&lt;-</span> run-sandboxed data
+<span id="L177" class="LineNr">177 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response:offset</span>, response
+<span id="L178" class="LineNr">178 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
+<span id="L179" class="LineNr">179 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">trace:offset</span>, trace
+<span id="L180" class="LineNr">180 </span>]
+<span id="L181" class="LineNr">181 </span>
+<span id="L182" class="LineNr">182 </span><span class="Comment"># clicks on sandbox code toggle its display-trace? flag</span>
+<span id="L183" class="LineNr">183 </span><span class="muRecipe">after</span> <span class="Constant">&lt;global-touch&gt;</span> [
+<span id="L184" class="LineNr">184 </span>  <span class="Comment"># check if it's inside the code of any sandbox</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Delimiter">{</span>
+<span id="L186" class="LineNr">186 </span>    sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L187" class="LineNr">187 </span>    click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
+<span id="L188" class="LineNr">188 </span>    on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
+<span id="L189" class="LineNr">189 </span>    <span class="muControl">break-unless</span> on-sandbox-side?
+<span id="L190" class="LineNr">190 </span>    first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L191" class="LineNr">191 </span>    <span class="muControl">break-unless</span> first-sandbox
+<span id="L192" class="LineNr">192 </span>    first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L193" class="LineNr">193 </span>    click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
+<span id="L194" class="LineNr">194 </span>    below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
+<span id="L195" class="LineNr">195 </span>    <span class="muControl">break-unless</span> below-sandbox-editor?
+<span id="L196" class="LineNr">196 </span>    <span class="Comment"># identify the sandbox whose code is being clicked on</span>
+<span id="L197" class="LineNr">197 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> find-click-in-sandbox-code env, click-row
+<span id="L198" class="LineNr">198 </span>    <span class="muControl">break-unless</span> sandbox
+<span id="L199" class="LineNr">199 </span>    <span class="Comment"># toggle its display-trace? property</span>
+<span id="L200" class="LineNr">200 </span>    x:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
+<span id="L201" class="LineNr">201 </span>    x <span class="Special">&lt;-</span> not x
+<span id="L202" class="LineNr">202 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">display-trace?:offset</span>, x
+<span id="L203" class="LineNr">203 </span>    hide-screen screen
+<span id="L204" class="LineNr">204 </span>    screen <span class="Special">&lt;-</span> render-sandbox-side screen, env, render
+<span id="L205" class="LineNr">205 </span>    screen <span class="Special">&lt;-</span> update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L206" class="LineNr">206 </span>    <span class="Comment"># no change in cursor</span>
+<span id="L207" class="LineNr">207 </span>    show-screen screen
+<span id="L208" class="LineNr">208 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Delimiter">}</span>
+<span id="L210" class="LineNr">210 </span>]
+<span id="L211" class="LineNr">211 </span>
+<span id="L212" class="LineNr">212 </span><span class="muRecipe">def</span> find-click-in-sandbox-code env:&amp;:environment, click-row:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox [
+<span id="L213" class="LineNr">213 </span>  <span class="Constant">local-scope</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Constant">load-ingredients</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Comment"># assert click-row &gt;= sandbox.starting-row-on-screen</span>
+<span id="L216" class="LineNr">216 </span>  sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L217" class="LineNr">217 </span>  start:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L218" class="LineNr">218 </span>  clicked-on-sandboxes?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, start
+<span id="L219" class="LineNr">219 </span>  assert clicked-on-sandboxes?, <span class="Constant">[extract-sandbox called on click to sandbox editor]</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Comment"># while click-row &lt; sandbox.next-sandbox.starting-row-on-screen</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Delimiter">{</span>
+<span id="L222" class="LineNr">222 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L223" class="LineNr">223 </span>    <span class="muControl">break-unless</span> next-sandbox
+<span id="L224" class="LineNr">224 </span>    next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L225" class="LineNr">225 </span>    found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
+<span id="L226" class="LineNr">226 </span>    <span class="muControl">break-if</span> found?
+<span id="L227" class="LineNr">227 </span>    sandbox <span class="Special">&lt;-</span> copy next-sandbox
+<span id="L228" class="LineNr">228 </span>    <span class="muControl">loop</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Delimiter">}</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Comment"># return sandbox if click is in its code region</span>
+<span id="L231" class="LineNr">231 </span>  code-ending-row:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>
+<span id="L232" class="LineNr">232 </span>  click-above-response?:bool <span class="Special">&lt;-</span> lesser-than click-row, code-ending-row
+<span id="L233" class="LineNr">233 </span>  start:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L234" class="LineNr">234 </span>  click-below-menu?:bool <span class="Special">&lt;-</span> greater-than click-row, start
+<span id="L235" class="LineNr">235 </span>  click-on-sandbox-code?:bool <span class="Special">&lt;-</span> and click-above-response?, click-below-menu?
+<span id="L236" class="LineNr">236 </span>  <span class="Delimiter">{</span>
+<span id="L237" class="LineNr">237 </span>    <span class="muControl">break-if</span> click-on-sandbox-code?
+<span id="L238" class="LineNr">238 </span>    <span class="muControl">return</span> <span class="Constant">0/no-click-in-sandbox-output</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Delimiter">}</span>
+<span id="L240" class="LineNr">240 </span>  <span class="muControl">return</span> sandbox
+<span id="L241" class="LineNr">241 </span>]
+<span id="L242" class="LineNr">242 </span>
+<span id="L243" class="LineNr">243 </span><span class="Comment"># when rendering a sandbox, dump its trace before response/warning if display-trace? property is set</span>
+<span id="L244" class="LineNr">244 </span><span class="muRecipe">after</span> <span class="Constant">&lt;render-sandbox-results&gt;</span> [
+<span id="L245" class="LineNr">245 </span>  <span class="Delimiter">{</span>
+<span id="L246" class="LineNr">246 </span>    display-trace?:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
+<span id="L247" class="LineNr">247 </span>    <span class="muControl">break-unless</span> display-trace?
+<span id="L248" class="LineNr">248 </span>    sandbox-trace:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">trace:offset</span>
+<span id="L249" class="LineNr">249 </span>    <span class="muControl">break-unless</span> sandbox-trace  <span class="Comment"># nothing to print; move on</span>
+<span id="L250" class="LineNr">250 </span>    row, screen <span class="Special">&lt;-</span> render-text screen, sandbox-trace, left, right, <span class="Constant">245/grey</span>, row
+<span id="L251" class="LineNr">251 </span>  <span class="Delimiter">}</span>
+<span id="L252" class="LineNr">252 </span><span class="Constant">  &lt;render-sandbox-trace-done&gt;</span>
+<span id="L253" class="LineNr">253 </span>]
 </pre>
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