SDL3: Unknown SDL_MouseID/SDL_KeyboardID in events

[TheMode]

Listened to SDL_EVENT_MOUSE_BUTTON_DOWN and SDL_EVENT_KEY_DOWN, I then tried to respectively retrieve event->button.which and event->key.which.

On Windows 11, mouse and keyboard devices always seem to be 0.

On MacOS, keyboard is correct (although there is still only one device, see #12319), mouse is always 0.

[expikr]

Duplicate of #11259

[TheMode]

Alright, went forward with relative mouse and it seems to work (outside of an ImGui bug I issued)

Remain the issue with keyboards which continuously returns 0 on Windows

[expikr]

also duplicate of #11336