Small changes

core/block.js

@@ -259,6 +259,10 @@ Blockly.Block.prototype.dispose = function(healStack) {
     // well as corruption of the connection database.  Therefore we must
     // methodically step through the blocks and carefully disassemble them.
 
+    if (Blockly.selected == this) {
+      Blockly.selected = null;
+    }
+
     // First, dispose of all my children.
     for (var i = this.childBlocks_.length - 1; i >= 0; i--) {
       this.childBlocks_[i].dispose(false);
@@ -365,7 +369,7 @@ Blockly.Block.prototype.getConnections_ = function(_all) {
  * @return {Blockly.Connection} The last next connection on the stack, or null.
  * @package
  */
-Blockly.Block.prototype.lastConnectionInStack_ = function() {
+Blockly.Block.prototype.lastConnectionInStack = function() {
   var nextConnection = this.nextConnection;
   while (nextConnection) {
     var nextBlock = nextConnection.targetBlock();
@@ -1282,7 +1286,6 @@ Blockly.Block.prototype.interpolate_ = function(message, args, lastDummyAlign) {
             case 'input_dummy':
               input = this.appendDummyInput(element['name']);
               break;
-
             default:
               field = Blockly.Field.fromJson(element);
 

core/block_svg.js

@@ -36,6 +36,7 @@ goog.require('Blockly.RenderedConnection');
 goog.require('Blockly.Tooltip');
 goog.require('Blockly.Touch');
 goog.require('Blockly.utils');
+
 goog.require('goog.Timer');
 goog.require('goog.asserts');
 goog.require('goog.dom');
@@ -320,13 +321,18 @@ Blockly.BlockSvg.prototype.getRelativeToSurfaceXY = function() {
  */
 Blockly.BlockSvg.prototype.moveBy = function(dx, dy) {
   goog.asserts.assert(!this.parentBlock_, 'Block has parent.');
-  var event = new Blockly.Events.BlockMove(this);
+  var eventsEnabled = Blockly.Events.isEnabled();
+  if (eventsEnabled) {
+    var event = new Blockly.Events.BlockMove(this);
+  }
   var xy = this.getRelativeToSurfaceXY();
   this.translate(xy.x + dx, xy.y + dy);
   this.moveConnections_(dx, dy);
-  event.recordNew();
+  if (eventsEnabled) {
+    event.recordNew();
+    Blockly.Events.fire(event);
+  }
   this.workspace.resizeContents();
-  Blockly.Events.fire(event);
 };
 
 /**
@@ -570,7 +576,7 @@ Blockly.BlockSvg.prototype.createTabList_ = function() {
  * @private
  */
 Blockly.BlockSvg.prototype.onMouseDown_ = function(e) {
-  var gesture = this.workspace.getGesture(e);
+  var gesture = this.workspace && this.workspace.getGesture(e);
   if (gesture) {
     gesture.handleBlockStart(e, this);
   }

core/dragged_connection_manager.js

@@ -215,7 +215,7 @@ Blockly.DraggedConnectionManager.prototype.addHighlighting_ = function() {
 Blockly.DraggedConnectionManager.prototype.initAvailableConnections_ = function() {
   var available = this.topBlock_.getConnections_(false);
   // Also check the last connection on this stack
-  var lastOnStack = this.topBlock_.lastConnectionInStack_();
+  var lastOnStack = this.topBlock_.lastConnectionInStack();
   if (lastOnStack && lastOnStack != this.topBlock_.nextConnection) {
     available.push(lastOnStack);
   }