Cannot delayed opening context menu

It is currently not possible to open a context menu during a VisualElement.schedule.Execute(). There are some use cases where we have to delay the opening of a context menu in order to ensure mouse events and focus changed were processed.

For instance, if you want to show a context menu on a TreeView/ListView. Because on MacOS, context menus are shown on MouseDown, the ContextMenu manipulator would catch the mouse event because the TreeView/ListView, which means it would try to open a menu before the TreeView's selection is changed. In such case, one of the solution would be to delay the context menu.

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