unawarez a7b3401ed5 support Wayland GTK backend in Window.GetHandle ...

This adds support for getting a Wayland `wl_surface` from
`Window.GetHandle`. The behavior of the function is now to return either
an X11 window ID or Wayland `wl_surface` if running a GTK build on those
backends, return 0 on any other GTK backend, or else return the C++
`GetHandle` result unmodified. This is the simplest fix for the Wayland
issue without worrying about breaking existing user code, as this
function already failed for any non-X11 GTK build. Returning 0 on
non-X11/Wayland GTK platforms sidesteps the issue of making sure e.g.
GTK Mac GetHandle returns the same type as native Cocoa Mac GetHandle.

2024-06-20 13:29:28 -05:00

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