DRY: factor out common handle_keyevent method

This method was identical in both CodeCell and TextCell

IPython/html/static/notebook/js/cell.js

@@ -230,6 +230,26 b' var IPython = (function (IPython) {'
     };
 
     /**
+     * Either delegates keyboard shortcut handling to either IPython keyboard
+     * manager when in command mode, or CodeMirror when in edit mode
+     *
+     * @method handle_keyevent
+     * @param {CodeMirror} editor - The codemirror instance bound to the cell
+     * @param {event} event -
+     * @return {Boolean} `true` if CodeMirror should ignore the event, `false` Otherwise
+     */
+    CodeCell.prototype.handle_keyevent = function (editor, event) {
+
+        // console.log('CM', this.mode, event.which, event.type)
+
+        if (this.mode === 'command') {
+            return true;
+        } else if (this.mode === 'edit') {
+            return this.handle_codemirror_keyevent(editor, event);
+        }
+    };
+
+    /**
      * @method at_top
      * @return {Boolean}
      */

IPython/html/static/notebook/js/codecell.js

@@ -171,16 +171,6 b' var IPython = (function (IPython) {'
         );
     };
 
-    CodeCell.prototype.handle_keyevent = function (editor, event) {
-
-        // console.log('CM', this.mode, event.which, event.type)
-
-        if (this.mode === 'command') {
-            return true;
-        } else if (this.mode === 'edit') {
-            return this.handle_codemirror_keyevent(editor, event);
-        }
-    };
 
     /**
      *  This method gets called in CodeMirror's onKeyDown/onKeyPress

IPython/html/static/notebook/js/textcell.js

@@ -113,22 +113,11 b' var IPython = (function (IPython) {'
         });
     };
 
-    TextCell.prototype.handle_keyevent = function (editor, event) {
-
-        // console.log('CM', this.mode, event.which, event.type)
-
-        if (this.mode === 'command') {
-            return true;
-        } else if (this.mode === 'edit') {
-            return this.handle_codemirror_keyevent(editor, event);
-        }
-    };
-
     /**
      * This method gets called in CodeMirror's onKeyDown/onKeyPress
      * handlers and is used to provide custom key handling.
      *
-     * Subclass should override this method to have custom handeling
+     * Subclass should override this method to have custom handling
      *
      * @method handle_codemirror_keyevent
      * @param {CodeMirror} editor - The codemirror instance bound to the cell