3879

6 files changed, 68 insertions, 80 deletions

diff --git a/065duplex_list.mu b/065duplex_list.mu
index 58b5468e..85683786 100644
--- a/065duplex_list.mu
+++ b/065duplex_list.mu
@@ -493,23 +493,17 @@ scenario remove-range-to-end [
   ]
 ]
 
-# insert list beginning at 'new' after 'in'
-def insert-range in:&:duplex-list:_elem, start:&:duplex-list:_elem/contained-in:in -> in:&:duplex-list:_elem [
+# insert list beginning at 'start' after 'in'
+def splice in:&:duplex-list:_elem, start:&:duplex-list:_elem/contained-in:in -> in:&:duplex-list:_elem [
   local-scope
   load-ingredients
   return-unless in
   return-unless start
-  end:&:duplex-list:_elem <- copy start
-  {
-    next:&:duplex-list:_elem <- next end/insert-range
-    break-unless next
-    end <- copy next
-    loop
-  }
+  end:&:duplex-list:_elem <- last start
   next:&:duplex-list:_elem <- next in
-  *end <- put *end, next:offset, next
   {
     break-unless next
+    *end <- put *end, next:offset, next
     *next <- put *next, prev:offset, end
   }
   *in <- put *in, next:offset, start
diff --git a/edit/012-editor-undo.mu b/edit/012-editor-undo.mu
index c2f6bca3..69e1c22b 100644
--- a/edit/012-editor-undo.mu
+++ b/edit/012-editor-undo.mu
@@ -415,7 +415,7 @@ after <handle-redo> [
     before-cursor <- get *editor, before-cursor:offset
     insert-from:&:duplex-list:char <- get typing, insert-from:offset  # ignore insert-to because it's already been spliced away
     # assert insert-to matches next(before-cursor)
-    insert-range before-cursor, insert-from
+    splice before-cursor, insert-from
     # assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen
     cursor-row <- get typing, after-row:offset
     *editor <- put *editor, cursor-row:offset, cursor-row
@@ -1636,7 +1636,7 @@ before <backspace-character-end> [
       break-unless coalesce?
       deletion <- put deletion, delete-from:offset, before-cursor
       backspaced-so-far:&:duplex-list:char <- get deletion, deleted-text:offset
-      insert-range backspaced-cell, backspaced-so-far
+      splice backspaced-cell, backspaced-so-far
       deletion <- put deletion, deleted-text:offset, backspaced-cell
       deletion <- put deletion, after-row:offset, cursor-row
       deletion <- put deletion, after-column:offset, cursor-column
@@ -1661,7 +1661,7 @@ after <handle-undo> [
     break-unless anchor
     deleted:&:duplex-list:char <- get deletion, deleted-text:offset
     old-cursor:&:duplex-list:char <- last deleted
-    insert-range anchor, deleted
+    splice anchor, deleted
     # assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen
     before-cursor <- copy old-cursor
     cursor-row <- get deletion, before-row:offset
diff --git a/html/065duplex_list.mu.html b/html/065duplex_list.mu.html
index 55bb4707..8f0cf4a8 100644
--- a/html/065duplex_list.mu.html
+++ b/html/065duplex_list.mu.html
@@ -555,70 +555,64 @@ if ('onhashchange' in window) {
 <span id="L493" class="LineNr">493 </span>  ]
 <span id="L494" class="LineNr">494 </span>]
 <span id="L495" class="LineNr">495 </span>
-<span id="L496" class="LineNr">496 </span><span class="Comment"># insert list beginning at 'new' after 'in'</span>
-<span id="L497" class="LineNr">497 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L497'>insert-range</a> in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem, start:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem/contained-in:in<span class="muRecipe"> -&gt; </span>in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
+<span id="L496" class="LineNr">496 </span><span class="Comment"># insert list beginning at 'start' after 'in'</span>
+<span id="L497" class="LineNr">497 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L497'>splice</a> in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem, start:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem/contained-in:in<span class="muRecipe"> -&gt; </span>in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
 <span id="L498" class="LineNr">498 </span>  <span class="Constant">local-scope</span>
 <span id="L499" class="LineNr">499 </span>  <span class="Constant">load-ingredients</span>
 <span id="L500" class="LineNr">500 </span>  <span class="muControl">return-unless</span> in
 <span id="L501" class="LineNr">501 </span>  <span class="muControl">return-unless</span> start
-<span id="L502" class="LineNr">502 </span>  end:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> copy start
-<span id="L503" class="LineNr">503 </span>  <span class="Delimiter">{</span>
-<span id="L504" class="LineNr">504 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end/insert-range
+<span id="L502" class="LineNr">502 </span>  end:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L522'>last</a> start
+<span id="L503" class="LineNr">503 </span>  <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> in
+<span id="L504" class="LineNr">504 </span>  <span class="Delimiter">{</span>
 <span id="L505" class="LineNr">505 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L506" class="LineNr">506 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L507" class="LineNr">507 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L506" class="LineNr">506 </span>  <span class="Conceal">¦</span> *end <span class="Special">&lt;-</span> put *end, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L507" class="LineNr">507 </span>  <span class="Conceal">¦</span> *next <span class="Special">&lt;-</span> put *next, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, end
 <span id="L508" class="LineNr">508 </span>  <span class="Delimiter">}</span>
-<span id="L509" class="LineNr">509 </span>  <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> in
-<span id="L510" class="LineNr">510 </span>  *end <span class="Special">&lt;-</span> put *end, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L511" class="LineNr">511 </span>  <span class="Delimiter">{</span>
-<span id="L512" class="LineNr">512 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L513" class="LineNr">513 </span>  <span class="Conceal">¦</span> *next <span class="Special">&lt;-</span> put *next, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, end
-<span id="L514" class="LineNr">514 </span>  <span class="Delimiter">}</span>
-<span id="L515" class="LineNr">515 </span>  *in <span class="Special">&lt;-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, start
-<span id="L516" class="LineNr">516 </span>  *start <span class="Special">&lt;-</span> put *start, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, in
-<span id="L517" class="LineNr">517 </span>]
-<span id="L518" class="LineNr">518 </span>
-<span id="L519" class="LineNr">519 </span><span class="muRecipe">def</span> append in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem, new:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem/contained-in:in<span class="muRecipe"> -&gt; </span>in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
-<span id="L520" class="LineNr">520 </span>  <span class="Constant">local-scope</span>
-<span id="L521" class="LineNr">521 </span>  <span class="Constant">load-ingredients</span>
-<span id="L522" class="LineNr">522 </span>  <a href='065duplex_list.mu.html#L528'>last</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L528'>last</a> in
-<span id="L523" class="LineNr">523 </span>  *last <span class="Special">&lt;-</span> put *last, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, new
-<span id="L524" class="LineNr">524 </span>  <span class="muControl">return-unless</span> new
-<span id="L525" class="LineNr">525 </span>  *new <span class="Special">&lt;-</span> put *new, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, <a href='065duplex_list.mu.html#L528'>last</a>
-<span id="L526" class="LineNr">526 </span>]
-<span id="L527" class="LineNr">527 </span>
-<span id="L528" class="LineNr">528 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L528'>last</a> in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem<span class="muRecipe"> -&gt; </span>result:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
-<span id="L529" class="LineNr">529 </span>  <span class="Constant">local-scope</span>
-<span id="L530" class="LineNr">530 </span>  <span class="Constant">load-ingredients</span>
-<span id="L531" class="LineNr">531 </span>  result <span class="Special">&lt;-</span> copy in
-<span id="L532" class="LineNr">532 </span>  <span class="Delimiter">{</span>
-<span id="L533" class="LineNr">533 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> result
-<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L537" class="LineNr">537 </span>  <span class="Delimiter">}</span>
-<span id="L538" class="LineNr">538 </span>]
-<span id="L539" class="LineNr">539 </span>
-<span id="L540" class="LineNr">540 </span><span class="Comment"># helper for debugging</span>
-<span id="L541" class="LineNr">541 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L541'>dump-from</a> x:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
-<span id="L542" class="LineNr">542 </span>  <span class="Constant">local-scope</span>
-<span id="L543" class="LineNr">543 </span>  <span class="Constant">load-ingredients</span>
-<span id="L544" class="LineNr">544 </span>  $print x, <span class="Constant">[: ]</span>
-<span id="L545" class="LineNr">545 </span>  <span class="Delimiter">{</span>
-<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> x
-<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> c:_elem <span class="Special">&lt;-</span> get *x, <span class="Constant">value:offset</span>
-<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span> $print c, <span class="Constant">[ ]</span>
-<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> x
-<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
-<span id="L551" class="LineNr">551 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> is-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-newline?
-<span id="L553" class="LineNr">553 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print <span class="Constant">10/newline</span>
-<span id="L554" class="LineNr">554 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print x, <span class="Constant">[: ]</span>
-<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L556" class="LineNr">556 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L557" class="LineNr">557 </span>  <span class="Delimiter">}</span>
-<span id="L558" class="LineNr">558 </span>  $print <span class="Constant">10/newline</span>, <span class="Constant">[---]</span>, <span class="Constant">10/newline</span>
-<span id="L559" class="LineNr">559 </span>]
+<span id="L509" class="LineNr">509 </span>  *in <span class="Special">&lt;-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, start
+<span id="L510" class="LineNr">510 </span>  *start <span class="Special">&lt;-</span> put *start, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, in
+<span id="L511" class="LineNr">511 </span>]
+<span id="L512" class="LineNr">512 </span>
+<span id="L513" class="LineNr">513 </span><span class="muRecipe">def</span> append in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem, new:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem/contained-in:in<span class="muRecipe"> -&gt; </span>in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
+<span id="L514" class="LineNr">514 </span>  <span class="Constant">local-scope</span>
+<span id="L515" class="LineNr">515 </span>  <span class="Constant">load-ingredients</span>
+<span id="L516" class="LineNr">516 </span>  <a href='065duplex_list.mu.html#L522'>last</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L522'>last</a> in
+<span id="L517" class="LineNr">517 </span>  *last <span class="Special">&lt;-</span> put *last, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, new
+<span id="L518" class="LineNr">518 </span>  <span class="muControl">return-unless</span> new
+<span id="L519" class="LineNr">519 </span>  *new <span class="Special">&lt;-</span> put *new, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, <a href='065duplex_list.mu.html#L522'>last</a>
+<span id="L520" class="LineNr">520 </span>]
+<span id="L521" class="LineNr">521 </span>
+<span id="L522" class="LineNr">522 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L522'>last</a> in:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem<span class="muRecipe"> -&gt; </span>result:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
+<span id="L523" class="LineNr">523 </span>  <span class="Constant">local-scope</span>
+<span id="L524" class="LineNr">524 </span>  <span class="Constant">load-ingredients</span>
+<span id="L525" class="LineNr">525 </span>  result <span class="Special">&lt;-</span> copy in
+<span id="L526" class="LineNr">526 </span>  <span class="Delimiter">{</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> result
+<span id="L528" class="LineNr">528 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L529" class="LineNr">529 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L530" class="LineNr">530 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L531" class="LineNr">531 </span>  <span class="Delimiter">}</span>
+<span id="L532" class="LineNr">532 </span>]
+<span id="L533" class="LineNr">533 </span>
+<span id="L534" class="LineNr">534 </span><span class="Comment"># helper for debugging</span>
+<span id="L535" class="LineNr">535 </span><span class="muRecipe">def</span> <a href='065duplex_list.mu.html#L535'>dump-from</a> x:&amp;:<a href='065duplex_list.mu.html#L3'>duplex-list</a>:_elem [
+<span id="L536" class="LineNr">536 </span>  <span class="Constant">local-scope</span>
+<span id="L537" class="LineNr">537 </span>  <span class="Constant">load-ingredients</span>
+<span id="L538" class="LineNr">538 </span>  $print x, <span class="Constant">[: ]</span>
+<span id="L539" class="LineNr">539 </span>  <span class="Delimiter">{</span>
+<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> x
+<span id="L541" class="LineNr">541 </span>  <span class="Conceal">¦</span> c:_elem <span class="Special">&lt;-</span> get *x, <span class="Constant">value:offset</span>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> $print c, <span class="Constant">[ ]</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> x
+<span id="L544" class="LineNr">544 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L545" class="LineNr">545 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> is-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-newline?
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print <span class="Constant">10/newline</span>
+<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print x, <span class="Constant">[: ]</span>
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L551" class="LineNr">551 </span>  <span class="Delimiter">}</span>
+<span id="L552" class="LineNr">552 </span>  $print <span class="Constant">10/newline</span>, <span class="Constant">[---]</span>, <span class="Constant">10/newline</span>
+<span id="L553" class="LineNr">553 </span>]
 </pre>
 </body>
 </html>
diff --git a/html/edit/003-shortcuts.mu.html b/html/edit/003-shortcuts.mu.html
index 3ad4d89e..bf5f463c 100644
--- a/html/edit/003-shortcuts.mu.html
+++ b/html/edit/003-shortcuts.mu.html
@@ -3052,8 +3052,8 @@ if ('onhashchange' in window) {
 <span id="L2990" class="LineNr">2990 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
 <span id="L2991" class="LineNr">2991 </span>  <span class="Comment"># keep one line in common with previous page</span>
 <span id="L2992" class="LineNr">2992 </span>  <span class="Delimiter">{</span>
-<span id="L2993" class="LineNr">2993 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L528'>last</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
-<span id="L2994" class="LineNr">2994 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L528'>last</a>, <span class="Constant">10/newline</span>
+<span id="L2993" class="LineNr">2993 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L522'>last</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
+<span id="L2994" class="LineNr">2994 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L522'>last</a>, <span class="Constant">10/newline</span>
 <span id="L2995" class="LineNr">2995 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?:bool
 <span id="L2996" class="LineNr">2996 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
 <span id="L2997" class="LineNr">2997 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
diff --git a/html/edit/012-editor-undo.mu.html b/html/edit/012-editor-undo.mu.html
index af9e02dd..2eb92fd0 100644
--- a/html/edit/012-editor-undo.mu.html
+++ b/html/edit/012-editor-undo.mu.html
@@ -478,7 +478,7 @@ if ('onhashchange' in window) {
 <span id="L415" class="LineNr"> 415 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
 <span id="L416" class="LineNr"> 416 </span>  <span class="Conceal">¦</span> insert-from:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-from:offset</span>  <span class="Comment"># ignore insert-to because it's already been spliced away</span>
 <span id="L417" class="LineNr"> 417 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert insert-to matches next(before-cursor)</span>
-<span id="L418" class="LineNr"> 418 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>insert-range</a> before-cursor, insert-from
+<span id="L418" class="LineNr"> 418 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>splice</a> before-cursor, insert-from
 <span id="L419" class="LineNr"> 419 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
 <span id="L420" class="LineNr"> 420 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get typing, <span class="Constant">after-row:offset</span>
 <span id="L421" class="LineNr"> 421 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
@@ -1699,7 +1699,7 @@ if ('onhashchange' in window) {
 <span id="L1636" class="LineNr">1636 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> coalesce?
 <span id="L1637" class="LineNr">1637 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">delete-from:offset</span>, before-cursor
 <span id="L1638" class="LineNr">1638 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> backspaced-so-far:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
-<span id="L1639" class="LineNr">1639 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>insert-range</a> backspaced-cell, backspaced-so-far
+<span id="L1639" class="LineNr">1639 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>splice</a> backspaced-cell, backspaced-so-far
 <span id="L1640" class="LineNr">1640 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">deleted-text:offset</span>, backspaced-cell
 <span id="L1641" class="LineNr">1641 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-row:offset</span>, cursor-row
 <span id="L1642" class="LineNr">1642 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-column:offset</span>, cursor-column
@@ -1723,8 +1723,8 @@ if ('onhashchange' in window) {
 <span id="L1660" class="LineNr">1660 </span>  <span class="Conceal">¦</span> anchor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-from:offset</span>
 <span id="L1661" class="LineNr">1661 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> anchor
 <span id="L1662" class="LineNr">1662 </span>  <span class="Conceal">¦</span> deleted:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
-<span id="L1663" class="LineNr">1663 </span>  <span class="Conceal">¦</span> old-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L528'>last</a> deleted
-<span id="L1664" class="LineNr">1664 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>insert-range</a> anchor, deleted
+<span id="L1663" class="LineNr">1663 </span>  <span class="Conceal">¦</span> old-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L522'>last</a> deleted
+<span id="L1664" class="LineNr">1664 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L497'>splice</a> anchor, deleted
 <span id="L1665" class="LineNr">1665 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
 <span id="L1666" class="LineNr">1666 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy old-cursor
 <span id="L1667" class="LineNr">1667 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-row:offset</span>
diff --git a/sandbox/012-editor-undo.mu b/sandbox/012-editor-undo.mu
index bf64cd75..a64b40d4 100644
--- a/sandbox/012-editor-undo.mu
+++ b/sandbox/012-editor-undo.mu
@@ -415,7 +415,7 @@ after <handle-redo> [
     before-cursor <- get *editor, before-cursor:offset
     insert-from:&:duplex-list:char <- get typing, insert-from:offset  # ignore insert-to because it's already been spliced away
     # assert insert-to matches next(before-cursor)
-    insert-range before-cursor, insert-from
+    splice before-cursor, insert-from
     # assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen
     cursor-row <- get typing, after-row:offset
     *editor <- put *editor, cursor-row:offset, cursor-row
@@ -1434,7 +1434,7 @@ before <backspace-character-end> [
       break-unless coalesce?
       deletion <- put deletion, delete-from:offset, before-cursor
       backspaced-so-far:&:duplex-list:char <- get deletion, deleted-text:offset
-      insert-range backspaced-cell, backspaced-so-far
+      splice backspaced-cell, backspaced-so-far
       deletion <- put deletion, deleted-text:offset, backspaced-cell
       deletion <- put deletion, after-row:offset, cursor-row
       deletion <- put deletion, after-column:offset, cursor-column
@@ -1459,7 +1459,7 @@ after <handle-undo> [
     break-unless anchor
     deleted:&:duplex-list:char <- get deletion, deleted-text:offset
     old-cursor:&:duplex-list:char <- last deleted
-    insert-range anchor, deleted
+    splice anchor, deleted
     # assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen
     before-cursor <- copy old-cursor
     cursor-row <- get deletion, before-row:offset