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If the program uses xdg-desktop-portal, the file picker isn't provided by the toolkit but by your desktop / portal implementation.
Yeah, i mean outside of that. General Gtk and Qt applications.
Outside of that the toolkit's file picker is used, as the system doesn't seem to provide one (via the portal), so the only reasonable fallback is to show the file picker that you know is there, which is the one of the application's toolkit.