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
/**
     * Returns the <code>UndoContext</code> for this view.
     * The navigator considers the workspace the context for undo.
     * 
     * @return the undo context for this view
     * @since 3.1
     */
    protected IUndoContext getUndoContext() { 
    	return (IUndoContext)ResourcesPlugin.getWorkspace().getAdapter(IUndoContext.class);
    }
    
    /**
     * Creates global action handlers for undo and redo.
     *
     * @since 3.1
     */
    protected void createGlobalActionHandlers() {
    	IUndoContext undoContext = getUndoContext();
    	if (undoContext != null) {
	        /* Set up an undo redo action group that operates on the current context.
			   The last parameter indicates that we want to prune the undo history when there 
			   is an invalid operation on top.  */
	        new UndoRedoActionGroup(this.getSite(), undoContext, true);
    	}
    	
    }
    
}