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Fix IE flyout button callback (#2719)
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@@ -79,7 +79,9 @@ Blockly.FlyoutButton = function(workspace, targetWorkspace, xml, isLabel) {
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* @type {string}
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* @private
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*/
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this.callbackKey_ = xml.getAttribute('callbackKey');
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this.callbackKey_ = xml.getAttribute('callbackKey')
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/* Check the lower case version too to satisfy IE */
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|| xml.getAttribute('callbackkey');
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/**
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* If specified, a CSS class to add to this button.
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