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The list of popovers will specify the stacking order, a _gtk_window_raise_popover() private call has been added so popover widgets can request being on top. Also, the stacking on popovers is ensured on gtk_window_size_allocate(), after the size/stacking changes on the child widget have finished, this will ensure popovers are kept on top of window contents. https://bugzilla.gnome.org/show_bug.cgi?id=756670
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