improved dropping command blocks into reporter rings

HISTORY.md

@@ -41,6 +41,7 @@
 ### 2019-02-07
 * Store: tweaked loading mechanism to enable command blocks inside reporter rings
 * Objects: tweaked spec for settings getter
+* Blocks: improved dropping command blocks into reporter rings
 
 ### 2019-02-06
 * Blocks, BYOB: refactored custom block input options and drop-down menus

src/blocks.js

@@ -11661,8 +11661,7 @@ RingReporterSlotMorph.prototype.attachTargets = function () {
 RingReporterSlotMorph.prototype.nestedBlock = function (block) {
     if (block) {
         var nb = this.nestedBlock();
-        this.contents().destroy();
-        this.add(block);
+        this.silentReplaceInput(this.children[0], block);
         if (nb) {
             block.bottomBlock().nextBlock(nb);
         }