docs: Explain events for already plugged in controllers #11349
Merged
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Description
Add documentation for when GAMEPAD_ADDED events are added to the event queue.
Unlike SDL 3, new events are not generated during AddMapping* functions. You have to call AddMapping* before SDL_Init if you rely on CONTROLLERDEVICEADDED events.
Existing Issue(s)
Backport of #11286
https://discourse.libsdl.org/t/deviced-added-events-for-devices-plugged-in-at-game-start/55039