Bug 94456 [Undo] - Resource Navigator not showing workspace undo actions
The Resource Navigator is not showing the workspace undo actions. Package Explorer is correctly working. Need to look at the difference in the way the action handlers are set up.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
control.removeListener(SWT.DragDetect, dragDetectListener);
        }
        super.dispose();
    }
    /**
     * An editor has been activated.  Sets the selection in this navigator
     * to be the editor's input, if linking is enabled.
     * 
     * @param editor the active editor
     * @since 2.0
     */
    protected void editorActivated(IEditorPart editor) {
        if (!isLinkingEnabled()) {
            return;
        }
        IFile file = ResourceUtil.getFile(editor.getEditorInput());
        if (file != null) {
            ISelection newSelection = new StructuredSelection(file);
            if (getTreeViewer().getSelection().equals(newSelection)) {
                getTreeViewer().getTree().showSelection();
            } else {
                getTreeViewer().setSelection(newSelection, true);
            }
        }
    }
    /**
     * Called when the context menu is about to open.
     * Delegates to the action group using the viewer's selection as the action context.
     * @since 2.0
     */