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 window is considered mapped if an XMapWindow() call has been made on it. It may not be visible on the screen for one of the following reasons:

如果对窗口进行了XMapWindow（）调用，则认为该窗口已映射，窗口在屏幕上不显示有如下愿意：

•   It is obscured by another opaque window.
•   One of its ancestors is not mapped.
•   It is entirely clipped by an ancestor.

• 它被一个看不到的透明窗口遮挡了。
• 一个祖先窗口没有被映射。（可能是父窗口，也可以能是父窗口的父窗口）
• 它完全被祖先剪掉了。（clipped 翻译裁剪，具体啥意思求教。）