Hi Simon,
See https://github.com/libsdl-org/SDL/issues/5136 for further analysis. osk-sdl maintainers: you might want to consider applying and/or upstreaming some of the "test: ..." commits from https://gitlab.com/smcv/osk-sdl/-/commits/reproduce-sdl-regression to improve the ability to debug this unit test. I do not intend to upstream these myself; feel free to redo them if a modified version makes more sense to you (but please move my name to a Co-authored-by if you do that).
Thanks for doing the analysis on this one, I've been meaning to get to it for a while now. I'll take a look at those commits early in the new year and see whether upstream is interested in them. They certainly look helpful for tracking this one down.
