Input methods in GTK4 apps on Wayland (opens in new tab)

When trying to type using an input method on GTK4 it simply doesn’t work. The same input methods work on GTK3, Qt5, Qt6, and a variety of other applications which don’t use any of these toolkits. GTK4 is the sole outlier. Running with WAYLAND_DEBUG=1 reveals that GTK4 applications don’t even try to bind to the zwp_text_input_manager_v3 global. A peek through GTK4’s code indicates that the default input method backend is simple, which is really a pseudo-backend which means “don’t use any input...