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,
gdk.window.Window.getUpdateArea returns null. You are responsible for
calling cairo.region.Region.destroy on the returned region if it’s non-null.
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, gdk.window.Window.getUpdateArea returns null. You are responsible for calling cairo.region.Region.destroy on the returned region if it’s non-null.