@elextr no idea, and I probably don't have many input method configured. Or maybe I do, I have absolutely no idea actually.
Anyway, I tried to make us respect the GTK settings in 90cc03a58d7a084929ad34a9d98adf344b136352 when we have VTE API for it (and I guess it's all fine because VTE 2.91 might depend on GTK >= 3.10). It's not so hard and should be the Right Thing™.