Ticket #6203: 6203.patch

_source/plugins/wysiwygarea/plugin.js

@@ -1006 +1006 @@
                                                 editor.document.$.designMode = 'on';
                                                 setTimeout( function()
                                                 {
-                                                        editor.document.$.designMode = 'off';
-                                                        if ( CKEDITOR.currentInstance == editor )
-                                                                editor.document.getBody().focus();
+                                                        if ( editor.document )
+                                                        {
+                                                                editor.document.$.designMode = 'off';
+                                                                if ( CKEDITOR.currentInstance == editor )
+                                                                        editor.document.getBody().focus();
+                                                        }
                                                 }, 50 );
                                         },
                                         function()

_source/plugins/undo/plugin.js

@@ -94 +94 @@
                                         undoManager.onChange();
                                 });
 
+                        // Make the undo manager unavailable after editor destroyed.
+                        editor.on( 'destroy', function()
+                                {
+                                        undoManager.enabled = 0;
+                                });
+
                         editor.ui.addButton( 'Undo',
                                 {
                                         label : editor.lang.undo,

_source/core/editor_basic.js

@@ -29 +29 @@
         /**
          * Creates an editor class instance. This constructor should be rarely
          * used, in favor of the {@link CKEDITOR} editor creation functions.
-         * @ class Represents an editor instance.
+         * @ class Represents an editor instance. (<strong>Note:</strong> All instance methods of "CKEDITOR.editor" invocation is invalid after editor instance destroyed by calling {@link CKEDITOR.editor#destroy})
          * @param {Object} instanceConfig Configuration values for this specific
          *              instance.
          * @param {CKEDITOR.dom.element} [element] The element linked to this