How to identify gdk window backend at runtime

It seems that gtk only provides compile time macros such as GDK_IS_X11_DISPLAY

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The #ifdef checks whether GTK was compiled with wayland support. The GTK_IS_WAYLAND_DISPLAY() is a runtime check.

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You can follow the example in the GDK documentation which explains how to use compile time and run time checks to know the backend currently in use.

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