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In 2.x, the !HAVE_XCONVERTCASE fallback of keyval_convert_case() was implicitly used as implementation for all !X11 backends. In 3.x, when this function was virtualized in GdkDisplayManager, this fallback was moved to the X11 backend and the other backends "equipped" with /* FIXME implement */ implementations of keyval_convert_case() which don't convert anything. Move the fallback code back to gdk/ as default implementation of GdkDisplayManager::keyval_convert_case() and remove its implementations is all backends but X11. Also remove the implementation in Wayland which was a plain copy of what is now the default implementation. (cherry picked from commit f46c1b76)
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