added hook for caching variadic inputs

HISTORY.md

@@ -7,6 +7,9 @@
 * **Notable Fixes:**
     * fixed keyboard formula entry for subtraction
 
+### 2020-12-17
+* blocks: added hook for caching variadic inputs
+
 ### 2020-12-16
 * threads, objects: added dev debugging hook for counting yields
 

snap.html

@@ -8,7 +8,7 @@
         <script src="src/morphic.js?version=2020-12-02"></script>
         <script src="src/symbols.js?version=2020-10-07"></script>
         <script src="src/widgets.js?version=2020-10-06"></script>
-        <script src="src/blocks.js?version=2020-12-15"></script>
+        <script src="src/blocks.js?version=2020-12-17"></script>
         <script src="src/threads.js?version=2020-12-16"></script>
         <script src="src/objects.js?version=2020-12-16"></script>
         <script src="src/gui.js?version=2020-12-15"></script>

src/blocks.js

@@ -158,7 +158,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2020-December-15';
+modules.blocks = '2020-December-17';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -11402,6 +11402,10 @@ MultiArgMorph.prototype = new ArgMorph();
 MultiArgMorph.prototype.constructor = MultiArgMorph;
 MultiArgMorph.uber = ArgMorph.prototype;
 
+// MultiArgMorph preferences settings:
+
+// MultiArgMorph.prototype.isCachingInputs = true; // commented out for now
+
 // MultiArgMorph instance creation:
 
 function MultiArgMorph(
@@ -11520,6 +11524,7 @@ MultiArgMorph.prototype.setContents = function (anArray) {
             inputs[i].setContents(anArray[i]);
         }
     }
+    this.cachedInputs = null;
 };
 
 // MultiArgMorph hiding and showing:
@@ -11680,6 +11685,7 @@ MultiArgMorph.prototype.addInput = function (contents) {
     this.children.splice(idx, 0, newPart);
     newPart.fixLayout();
     this.fixLayout();
+    this.cachedInputs = null;
     return newPart;
 };
 
@@ -11697,6 +11703,7 @@ MultiArgMorph.prototype.removeInput = function () {
         }
     }
     this.fixLayout();
+    this.cachedInputs = null;
 };
 
 MultiArgMorph.prototype.is3ArgRingInHOF = function () {