gdkWindowGetUpdateArea
Transfers ownership of the update area from window to the caller
of the function. That is, after calling this function, window will
no longer have an invalid/dirty region; the update area is removed
from window and handed to you. If a window has no update area,
gdkWindowGetUpdateArea returns NULL.
gdkWindowGetUpdateArea(object)
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[GdkRegion] the update area for window
Derived by RGtkGen from GTK+ documentation
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