Avoid enabling commands like undo/redo when changing filter (calling cmd.refresh).

Author: Reinmar

core/command.js

@@ -79,8 +79,9 @@ CKEDITOR.command = function( editor, commandDefinition ) {
 			return true;
 		}
 
-		// Make the "enabled" state as basis.
-		this.enable();
+		// Make the "enabled" state a default for commands enabled from start.
+		if ( !this.startDisabled )
+			this.enable();
 
 		if ( this.fire( 'refresh', { editor: editor, path: path } ) === false )
 			return true;

plugins/save/plugin.js

@@ -10,6 +10,7 @@
 (function() {
 	var saveCmd = {
 		readOnly: 1,
+		startDisabled: true,
 
 		exec: function( editor ) {
 			if ( editor.fire( 'save' ) ) {

plugins/undo/plugin.js

@@ -23,6 +23,7 @@
 						this.fire( 'afterUndo' );
 					}
 				},
+				startDisabled: true,
 				canUndo: false
 			} );
 
@@ -33,6 +34,7 @@
 						this.fire( 'afterRedo' );
 					}
 				},
+				startDisabled: true,
 				canUndo: false
 			} );