Tracking issue for changes/fixes in latest SDL version

[Susko3]

Fixed by https://github.com/libsdl-org/SDL/commit/6c962177272c6a2ce684e4298b40c25ebdd1ac74:

• https://github.com/ppy/osu-framework/issues/4159
• https://github.com/ppy/osu/issues/12228
• https://github.com/ppy/osu-framework/issues/4050 (probably fixed by something else)
• [x] #5136

Fixed by https://github.com/libsdl-org/SDL/commit/5ff42438e36e98c9d72ac70f5f5ce4599b96d3d2:

• https://github.com/ppy/osu-framework/issues/4055
• relevant: https://github.com/ppy/osu-framework/issues/1679
• SDL no longer sends SDL_WINDOWEVENT_ENTER and SDL_WINDOWEVENT_LEAVE events if any button is pressed when the mouse leaves and enters the window. This introduces a nasty bug with MouseHandler where relative mode won't be re-enabled if the mouse leaves and enters the window while holding down any buttons. This is by design.
• [x] #5163

Fixed by https://github.com/libsdl-org/SDL/pull/5398:

• https://github.com/ppy/osu/issues/17231
• This PR introduces a bug with our IME handling, as SDL will now send multiple SDL_TextInputEvents when the text is longer than 32 characters. Should be easy to fix, either delay resetting of recentImeResult, or match the SDL text with our composition text using string.Contains.
• [x] https://github.com/ppy/osu-framework/pull/5141
• [ ] update ResetIme to use SDL_ClearComposition on non-windows platforms.

General:

• [ ] Reach out to users affected by https://github.com/ppy/osu/issues/17381 and check if it's fixed.

Things to note

https://github.com/flibitijibibo/SDL2-CS is not updated to the latest SDL, and there is no open PR on their side. We can set the hints, but we won't be able to use SDL_ClearComposition.

[Susko3]

With the three PRs, we should be ready for an SDL bump. SDL2-CS was also recently bumped to 2.0.22. Making use of new APIs, such as SDL_ClearComposition(), can be added later.

We may want for https://github.com/libsdl-org/SDL/issues/5572 to be fixed, as noticed on discord.

[peppy]

I'll look to do a bump today or tomorrow if no one else beats me

[peppy]

@Susko3 1.0.518-alpha is now propagating to nuget. I'll leave it in your hands to consume it in the order of your choosing.