From 575b71246250d49c467ced08f4888fd72eae3ab2 Mon Sep 17 00:00:00 2001
From: Winston <winston@steveandkate.com>
Date: Thu, 20 Aug 2015 15:18:58 -0700
Subject: [PATCH] fix: https://github.com/google/blockly/issues/161

On iOS, if I use a pinch gesture in the workspace, these errors appear in the console:

Error: Invalid value for <rect> attribute x="NaN"
---
 core/blockly.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/blockly.js b/core/blockly.js
index 883bba13f..ab56ed941 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -294,6 +294,9 @@ Blockly.onMouseUp_ = function(e) {
  * @private
  */
 Blockly.onMouseMove_ = function(e) {
+  if (event.touches && event.touches.length >= 2) {
+    return  // multi-touch gestures won't have e.clientX
+  }
   var workspace = Blockly.getMainWorkspace();
   if (workspace.isScrolling) {
     Blockly.removeAllRanges();