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wp-includes/js/wpdialog.js

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+/**
+ * @output wp-includes/js/wpdialog.js
+ */
+
+/*
+ * Wrap the jQuery UI Dialog open function remove focus from tinyMCE.
+ */
+( function($) {
+	$.widget('wp.wpdialog', $.ui.dialog, {
+		open: function() {
+			// Add beforeOpen event.
+			if ( this.isOpen() || false === this._trigger('beforeOpen') ) {
+				return;
+			}
+
+			// Open the dialog.
+			this._super();
+
+			// WebKit leaves focus in the TinyMCE editor unless we shift focus.
+			this.element.focus();
+			this._trigger('refresh');
+		}
+	});
+
+	$.wp.wpdialog.prototype.options.closeOnEscape = false;
+
+})(jQuery);