3.2.5 Save Under Flag
Some server implementations may preserve contents of
InputOutput
windows under other
InputOutput
windows.
This is not the same as preserving the contents of a window for you.
You may get better visual
appeal if transient windows (for example, pop-up menus) request that the system
preserve the screen contents under them,
so the temporarily obscured applications do not have to repaint.
You can set the save-under flag to
True
or
False
(default).
If save-under is
True,
the X server is advised that, when this window is mapped,
saving the contents of windows it obscures would be beneficial.
Christophe Tronche, ch@tronche.com