rebuild.QuickHelp event sets the dirty bit

QuickHelp is rebuilt on show if the dirty bit was set.

IPython/html/static/base/js/keyboard.js

@@ -189,7 +189,7 @@ IPython.keyboard = (function (IPython) {
         this._shortcuts[shortcut] = data;
         if (!suppress_help_update) {
             // update the keyboard shortcuts notebook help
-            IPython.quick_help = new IPython.QuickHelp();
+            $([IPython.events]).trigger('rebuild.QuickHelp')
         }
     }
 
@@ -209,7 +209,7 @@ IPython.keyboard = (function (IPython) {
         IPython.quick_help = new IPython.QuickHelp();
         if (!suppress_help_update) {
             // update the keyboard shortcuts notebook help
-            IPython.quick_help = new IPython.QuickHelp();
+            $([IPython.events]).trigger('rebuild.QuickHelp');
         }
     }
 

IPython/html/static/notebook/js/quickhelp.js

@@ -18,6 +18,10 @@ var IPython = (function (IPython) {
     QuickHelp.prototype.show_keyboard_shortcuts = function () {
         // toggles display of keyboard shortcut dialog
         var that = this;
+        if ( this.force_rebuild ) {
+            delete(this.shortcut_dialog);
+            this.force_rebuild = false;
+        }
         if ( this.shortcut_dialog ){
             // if dialog is already shown, close it
             $(this.shortcut_dialog).modal("toggle");
@@ -57,6 +61,8 @@ var IPython = (function (IPython) {
                 Close : {}
             }
         });
+        
+        $([IPython.events]).on('rebuild.QuickHelp', function() { that.force_rebuild = true;});
     };
 
     QuickHelp.prototype.build_command_help = function () {