From b8d48ebabead89779a978a0c3c71b62aa8095c54 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Sat, 26 Mar 2016 19:37:12 -0700
Subject: [PATCH] Destroy attached shadow block when input is destroyed.

---
 core/block.js     | 11 +++++++++--
 core/block_svg.js |  2 +-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/core/block.js b/core/block.js
index 09fde8a27..3c2268fa9 100644
--- a/core/block.js
+++ b/core/block.js
@@ -1232,8 +1232,15 @@ Blockly.Block.prototype.removeInput = function(name, opt_quiet) {
   for (var i = 0, input; input = this.inputList[i]; i++) {
     if (input.name == name) {
       if (input.connection && input.connection.targetConnection) {
-        // Disconnect any attached block.
-        input.connection.targetBlock().unplug();
+        input.connection.setShadowDom(null);
+        var block = input.connection.targetBlock();
+        if (block.isShadow()) {
+          // Destroy any attached shadow block.
+          block.dispose();
+        } else {
+          // Disconnect any attached normal block.
+          block.unplug();
+        }
       }
       input.dispose();
       this.inputList.splice(i, 1);
diff --git a/core/block_svg.js b/core/block_svg.js
index fd71732c8..04d59cc5d 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -499,7 +499,7 @@ Blockly.BlockSvg.prototype.onMouseDown_ = function(e) {
     // Right-click.
     this.showContextMenu_(e);
   } else if (!this.isMovable()) {
-    // Allow unmovable blocks to be selected and context menued, but not
+    // Allow immovable blocks to be selected and context menued, but not
     // dragged.  Let this event bubble up to document, so the workspace may be
     // dragged instead.
     return;