switch to scripts tab when dragging a block into the editor pane

thanks, @jadga-h, for the idea!

HISTORY.md

@@ -5,6 +5,7 @@
 ### 2020-07-15
 * morphic: made keyboard handler (more) invisible, thanks, Bernat!
 * gui: made remaining synchronous http requests asynch (url: #open, #run)
+* morphic, gui: switch to scripts tab when dragging a block into the editor pane
 
 ### 2020-07-13
 * paint, symbols: new iconic buttons for grow, shrink and flip actions, thanks, Jadga!

src/gui.js

@@ -1624,6 +1624,12 @@ IDE_Morph.prototype.createSpriteEditor = function () {
 
         this.spriteEditor.acceptsDrops = false;
         this.spriteEditor.contents.acceptsDrops = false;
+
+        this.spriteEditor.contents.mouseEnterDragging = (morph) => {
+            if (morph instanceof BlockMorph) {
+                this.spriteBar.tabBar.tabTo('scripts');
+            }
+        }
     } else if (this.currentTab === 'sounds') {
         this.spriteEditor = new JukeboxMorph(
             this.currentSprite,
@@ -1634,6 +1640,12 @@ IDE_Morph.prototype.createSpriteEditor = function () {
         this.spriteEditor.updateSelection();
         this.spriteEditor.acceptDrops = false;
         this.spriteEditor.contents.acceptsDrops = false;
+
+        this.spriteEditor.contents.mouseEnterDragging = (morph) => {
+            if (morph instanceof BlockMorph) {
+                this.spriteBar.tabBar.tabTo('scripts');
+            }
+        }
     } else {
         this.spriteEditor = new Morph();
         this.spriteEditor.color = this.groupColor;

src/morphic.js

@@ -479,7 +479,7 @@
 
         MyMorph.prototype.mouseMove = function(pos) {};
 
-    All of these methods have as optional parameter a Point object
+    Most of these methods have as optional parameter a Point object
     indicating the current position of the Hand inside the World's
     coordinate system. The
 
@@ -489,6 +489,14 @@
     currently pressed mouse button, which is either 'left' or 'right'.
     You can use this to let users interact with 3D environments.
 
+    The
+
+        mouseEnterDragging(morph)
+        mouseLeaveDragging(morph)
+
+    event methods have as optional parameter the morph currently dragged by
+    the Hand, if any.
+
     Events may be "bubbled" up a morph's owner chain by calling
 
         this.escalateEvent(functionName, arg)
@@ -11423,7 +11431,7 @@ HandMorph.prototype.processMouseMove = function (event) {
                 old.mouseLeave();
             }
             if (old.mouseLeaveDragging && this.mouseButton) {
-                old.mouseLeaveDragging();
+                old.mouseLeaveDragging(this.children[0]);
             }
         }
     });
@@ -11433,7 +11441,7 @@ HandMorph.prototype.processMouseMove = function (event) {
                 newMorph.mouseEnter();
             }
             if (newMorph.mouseEnterDragging && this.mouseButton) {
-                newMorph.mouseEnterDragging();
+                newMorph.mouseEnterDragging(this.children[0]);
             }
         }