3.2.8 Override Redirect Flag
To control window placement or to add decoration,
a window manager often needs to intercept (redirect) any map or configure
Pop-up windows, however, often need to be mapped without a window manager
getting in the way.
To control whether an
window is to ignore these structure control facilities,
use the override-redirect flag.
The override-redirect flag specifies whether map and configure requests
on this window should override a
on the parent.
You can set the override-redirect flag to
Window managers use this information to avoid tampering with pop-up windows
(see also "Inter-Client Communication Functions").
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