Describe the bug

To Reproduce
run master(d856f7b) egui_demo_app, use fcitx5 ime to input unicode words in text_edit, press backspace won't delete char, but typing, ime input and del key still work.

Expected behavior
backspace delete char

Desktop (please complete the following information):

• OS: archlinux, fcitx5 5.1.10

Additional context
web version work
use chinese font not help