Include gtk3 OpenGL fix in Debian package

[Rene Hopf]

Hi,
I am maintaining a UI component for linuxcnc, which uses Debian https://linuxcnc.org/ <https://linuxcnc.org/>
While porting stuff from gtk2 to gtk3 I hit a bug in gtk, and already fixed it upstream.
https://gitlab.gnome.org/GNOME/gtk/-/commit/69334021a22a79f5fddb30f0872fcf3fc6bc1cf0 <https://gitlab.gnome.org/GNOME/gtk/-/commit/69334021a22a79f5fddb30f0872fcf3fc6bc1cf0>
It allows OpenGL contexts in gtk3 to work with software renderers.
What needs to be done to include this in Debian?

Thanks,

Rene
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