From 14ee069543046e8bd39694afee78865e620b9aa6 Mon Sep 17 00:00:00 2001
From: Tim Dawborn <tim.dawborn@gmail.com>
Date: Fri, 27 Jan 2017 13:50:49 +1100
Subject: [PATCH] Remove use of Array.prototype.includes which is not
 implemented in IE or Edge < 14. Fixes google/blockly#876.

---
 core/extensions.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/extensions.js b/core/extensions.js
index c13e7c867..4e03f7a26 100644
--- a/core/extensions.js
+++ b/core/extensions.js
@@ -107,7 +107,7 @@ Blockly.Extensions.buildTooltipForDropdown = function(dropdownName, lookupTable)
   var extensionFn = function() {
     var thisBlock = this;
 
-    if (this.type && !blockTypesChecked.includes(this.type)) {
+    if (this.type && blockTypesChecked.indexOf(this.type) === -1) {
       Blockly.Extensions.checkDropdownOptionsInTable_(
         this, dropdownName, lookupTable);
       blockTypesChecked.push(this.type);
@@ -117,7 +117,7 @@ Blockly.Extensions.buildTooltipForDropdown = function(dropdownName, lookupTable)
       var value = thisBlock.getFieldValue(dropdownName);
       var tooltip = lookupTable[value];
       if (tooltip == null) {
-        if (!blockTypesChecked.includes(thisBlock.type)) {
+        if (blockTypesChecked.indexOf(thisBlock.type) === -1) {
           // Warn for missing values on generated tooltips
           var warning = 'No tooltip mapping for value ' + value +
               ' of field ' + dropdownName;