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diff --git a/edit/010-sandbox-trace.mu b/edit/010-sandbox-trace.mu
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+## clicking on the code typed into a sandbox toggles its trace
+
+scenario sandbox-click-on-code-toggles-app-trace [
+  trace-until 100/app  # trace too long
+  assume-screen 100/width, 10/height
+  # basic recipe
+  1:address:array:character <- new [ 
+recipe foo [
+  stash [abc]
+]]
+  # run it
+  2:address:array:character <- new [foo]
+  assume-console [
+    press F4
+  ]
+  3:address:programming-environment-data <- new-programming-environment screen:address:screen, 1:address:array:character, 2:address:array:character
+  event-loop screen:address:screen, console:address:console, 3:address:programming-environment-data
+  screen-should-contain [
+    .                                                                                 run (F4)           .
+    .                                                  ┊                                                 .
+    .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .  stash [abc]                                     ┊0   edit          copy            delete         .
+    .]                                                 ┊foo                                              .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+  # click on the code in the sandbox
+  assume-console [
+    left-click 4, 51
+  ]
+  run [
+    event-loop screen:address:screen, console:address:console, 3:address:programming-environment-data
+    4:character/cursor-icon <- copy 9251/␣
+    print screen:address:screen, 4:character/cursor-icon
+  ]
+  # trace now printed and cursor shouldn't have budged
+  screen-should-contain [
+    .                                                                                 run (F4)           .
+    .␣                                                 ┊                                                 .
+    .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .  stash [abc]                                     ┊0   edit          copy            delete         .
+    .]                                                 ┊foo                                              .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊abc                                              .
+    .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+  screen-should-contain-in-color 245/grey, [
+    .                                                                                                    .
+    .                                                  ┊                                                 .
+    .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+    .                                                  ┊                                                 .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊abc                                              .
+    .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+  # click again on the same region
+  assume-console [
+    left-click 4, 55
+  ]
+  run [
+    event-loop screen:address:screen, console:address:console, 3:address:programming-environment-data
+    print screen:address:screen, 4:character/cursor-icon
+  ]
+  # trace hidden again
+  screen-should-contain [
+    .                                                                                 run (F4)           .
+    .␣                                                 ┊                                                 .
+    .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .  stash [abc]                                     ┊0   edit          copy            delete         .
+    .]                                                 ┊foo                                              .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+]
+
+scenario sandbox-shows-app-trace-and-result [
+  trace-until 100/app  # trace too long
+  assume-screen 100/width, 10/height
+  # basic recipe
+  1:address:array:character <- new [ 
+recipe foo [
+  stash [abc]
+  reply 4
+]]
+  # run it
+  2:address:array:character <- new [foo]
+  assume-console [
+    press F4
+  ]
+  3:address:programming-environment-data <- new-programming-environment screen:address:screen, 1:address:array:character, 2:address:array:character
+  event-loop screen:address:screen, console:address:console, 3:address:programming-environment-data
+  screen-should-contain [
+    .                                                                                 run (F4)           .
+    .                                                  ┊                                                 .
+    .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .  stash [abc]                                     ┊0   edit          copy            delete         .
+    .  reply 4                                         ┊foo                                              .
+    .]                                                 ┊4                                                .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+  # click on the code in the sandbox
+  assume-console [
+    left-click 4, 51
+  ]
+  run [
+    event-loop screen:address:screen, console:address:console, 3:address:programming-environment-data
+  ]
+  # trace now printed above result
+  screen-should-contain [
+    .                                                                                 run (F4)           .
+    .                                                  ┊                                                 .
+    .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .  stash [abc]                                     ┊0   edit          copy            delete         .
+    .  reply 4                                         ┊foo                                              .
+    .]                                                 ┊abc                                              .
+    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊4                                                .
+    .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.
+    .                                                  ┊                                                 .
+  ]
+]
+
+container sandbox-data [
+  trace:address:array:character
+  display-trace?:boolean
+]
+
+# replaced in a later layer
+def! update-sandbox sandbox:address:sandbox-data, env:address:programming-environment-data, idx:number -> sandbox:address:sandbox-data, env:address:programming-environment-data [
+  local-scope
+  load-ingredients
+  data:address:array:character <- get *sandbox, data:offset
+  response:address:array:character, _, fake-screen:address:screen, trace:address:array:character <- run-interactive data
+  *sandbox <- put *sandbox, response:offset, response
+  *sandbox <- put *sandbox, screen:offset, fake-screen
+  *sandbox <- put *sandbox, trace:offset, trace
+]
+
+# clicks on sandbox code toggle its display-trace? flag
+after <global-touch> [
+  # check if it's inside the code of any sandbox
+  {
+    sandbox-left-margin:number <- get *current-sandbox, left:offset
+    click-column:number <- get t, column:offset
+    on-sandbox-side?:boolean <- greater-or-equal click-column, sandbox-left-margin
+    break-unless on-sandbox-side?
+    first-sandbox:address:sandbox-data <- get *env, sandbox:offset
+    break-unless first-sandbox
+    first-sandbox-begins:number <- get *first-sandbox, starting-row-on-screen:offset
+    click-row:number <- get t, row:offset
+    below-sandbox-editor?:boolean <- greater-or-equal click-row, first-sandbox-begins
+    break-unless below-sandbox-editor?
+    # identify the sandbox whose code is being clicked on
+    sandbox:address:sandbox-data <- find-click-in-sandbox-code env, click-row
+    break-unless sandbox
+    # toggle its display-trace? property
+    x:boolean <- get *sandbox, display-trace?:offset
+    x <- not x
+    *sandbox <- put *sandbox, display-trace?:offset, x
+    hide-screen screen
+    screen <- render-sandbox-side screen, env, 1/clear
+    screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
+    # no change in cursor
+    show-screen screen
+    loop +next-event:label
+  }
+]
+
+def find-click-in-sandbox-code env:address:programming-environment-data, click-row:number -> sandbox:address:sandbox-data [
+  local-scope
+  load-ingredients
+  # assert click-row >= sandbox.starting-row-on-screen
+  sandbox <- get *env, sandbox:offset
+  start:number <- get *sandbox, starting-row-on-screen:offset
+  clicked-on-sandboxes?:boolean <- greater-or-equal click-row, start
+  assert clicked-on-sandboxes?, [extract-sandbox called on click to sandbox editor]
+  # while click-row < sandbox.next-sandbox.starting-row-on-screen
+  {
+    next-sandbox:address:sandbox-data <- get *sandbox, next-sandbox:offset
+    break-unless next-sandbox
+    next-start:number <- get *next-sandbox, starting-row-on-screen:offset
+    found?:boolean <- lesser-than click-row, next-start
+    break-if found?
+    sandbox <- copy next-sandbox
+    loop
+  }
+  # return sandbox if click is in its code region
+  code-ending-row:number <- get *sandbox, code-ending-row-on-screen:offset
+  click-above-response?:boolean <- lesser-than click-row, code-ending-row
+  start:number <- get *sandbox, starting-row-on-screen:offset
+  click-below-menu?:boolean <- greater-than click-row, start
+  click-on-sandbox-code?:boolean <- and click-above-response?, click-below-menu?
+  {
+    break-if click-on-sandbox-code?
+    return 0/no-click-in-sandbox-output
+  }
+  return sandbox
+]
+
+# when rendering a sandbox, dump its trace before response/warning if display-trace? property is set
+after <render-sandbox-results> [
+  {
+    display-trace?:boolean <- get *sandbox, display-trace?:offset
+    break-unless display-trace?
+    sandbox-trace:address:array:character <- get *sandbox, trace:offset
+    break-unless sandbox-trace  # nothing to print; move on
+    row, screen <- render screen, sandbox-trace, left, right, 245/grey, row
+  }
+  <render-sandbox-trace-done>
+]