Brick 8bf32e12d8 Improved SDL_PollEvent usage (#4794) ...

* Avoid unnecessary SDL_PumpEvents calls in SDL_WaitEventTimeout

* Add a sentinel event to avoid infinite poll loops

* Move SDL_POLLSENTINEL to new internal event category

* Tweak documentation to indicate SDL_PumpEvents isn't always called

* Avoid shadowing event variable

* Ignore poll sentinel if more (user) events have been added after

Co-authored-by: Sam Lantinga <slouken@libsdl.org>

2021-10-14 22:26:10 -07:00

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