An override redirect window is not under the control of the window manager. This means it won't have a titlebar, won't be minimizable, etc. - it will be entirely under the control of the application. The window manager can't see the override redirect window at all.
Override redirect should only be used for short-lived temporary
windows, such as popup menus.
GtkMenu uses an override redirect
window in its implementation, for example.
Derived by RGtkGen from GTK+ documentation
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