当小部件或它的父容器被关闭，SWT删除侦听器，从而打破那个牢固的关联。
When the widget, or its containing parent, is disposed, SWT removes the listeners, thereby breaking the strong association.
当小部件或它的父容器被关闭，SWT删除侦听器，从而打破那个牢固的关联。
When the widget, or its containing parent, is disposed, SWT removes the listeners, thereby breaking the strong association.
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