assume stage dimensions for "SWITCH TO COSTUME" with list if current costume dimensions don't fit

HISTORY.md

@@ -6,6 +6,7 @@
     * specifying alpha values is now optional for generating pixels in bitmaps (costumes), none means the pixel is solid 
     * new "add comment" option in the block context menu, thanks, Rob Fidler!
     * attribute selection in the SET block are now prefixed with "my"
+    * assume stage dimensions for "SWITCH TO COSTUME" with list if current costume dimensions don't fit
     * added "bar / lines" option for plotting charts in the "frequency distribution analysis" library
     * new "48 kHz" option in the "sampling rate" dropdown 
 * **Notable Fixes:**
@@ -18,6 +19,7 @@
 * Greek translation updata, thanks, HM100!
 * blocks, threads: prefixed attribute selection in the SET block with "my" 
 * German translation update
+* objects: assume stage dimensions for "SWITCH TO COSTUME" with list if current costume dimensions don't fit
 
 ### 2020-10-04
 * threads: made alpha values optional for generating costume pixels, none = solid

snap.html

@@ -10,7 +10,7 @@
         <script src="src/widgets.js?version=2020-07-27"></script>
         <script src="src/blocks.js?version=2020-10-05"></script>
         <script src="src/threads.js?version=2020-10-05"></script>
-        <script src="src/objects.js?version=2020-10-04"></script>
+        <script src="src/objects.js?version=2020-10-05"></script>
         <script src="src/gui.js?version=2020-09-25"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2020-07-01"></script>

src/objects.js

@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 HandleMorph, AlignmentMorph, Process, XML_Element, WorldMap, copyCanvas*/
 
-modules.objects = '2020-October-04';
+modules.objects = '2020-October-05';
 
 var SpriteMorph;
 var StageMorph;
@@ -3564,13 +3564,14 @@ SpriteMorph.prototype.doWearPreviousCostume = function () {
 };
 
 SpriteMorph.prototype.doSwitchToCostume = function (id, noShadow) {
-    var w, h;
+    var w = 0, h = 0;
     if (id instanceof List) { // try to turn a list of pixels into a costume
         if (this.costume) {
             // recycle dimensions of current costume
             w = this.costume.width();
             h = this.costume.height();
-        } else {
+        }
+        if (w * h !== id.length()) {
             // assume stage's dimensions
             w = StageMorph.prototype.dimensions.x;
             h = StageMorph.prototype.dimensions.y;