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And also explicitly remove pointer/keyboard grabs from the display. Whenever the grab is reported lost, we should popdown the combobox, so that the GDK_WINDOW_TEMP window is hidden and removed from the toplevel, as done with the menu for example. Leaving the GDK_WINDOW_TEMP window open when re-activating the application triggers several issues in the win32 backend, due to restacking windows of the non-toplevel group into the toplevel group: https://bugzilla.gnome.org/show_bug.cgi?id=695200
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