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Based on the Win32 implementation, as well as the macOS file chooser from https://github.com/GNOME/gedit/blob/master/gedit/gedit-file-chooser-dialog-osx.[ch] Not fully tested yet, but working properly so far. TODO: filter support, extra widget (label), documentation... https://bugzilla.gnome.org/show_bug.cgi?id=784723
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