Dead keys can edit QTextEdit widget despite readOnly on Linux?

[t_techcn]

Howdy,

I've been having a minor issue with a program since transitioning to PyQt6; On Linux, typing a character with a dead key modifier seems to let me edit the text inside a PyQt6.QtWidgets.QTextEdit widget even if I've set the text edit to read-only. Like so:

1. Highlight any part of the text.
2. With a keyboard with dead keys, press any diacritic and then a letter, like '`' + 'a' or '^' + '2'.

The character then replaces the selected part of the text.

I was able to reproduce this on Arch & Debian when using the script I've added as an attachment. PyQt5 doesn't seem to have this behavior, and it doesn't seem to occur with c++ Qt6 either as far as I can tell. Not sure how to prevent this with PyQt6.
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