input.c called SDL_SetRelativeMouseMode / SDL_ShowCursor from the scheduler
thread (every controller poll) and from the host thread's focus/click
handling at the same time. SDL's mouse API is not thread-safe; on Windows
relative mode starts/stops the raw-input thread, and clicking back into the
window after being unfocused is exactly when both threads flip it - the D287
freeze trigger. Callers now record the wanted state; inputApplyMouseRequests()
applies it on the host thread from videoPumpEvents(). Queue-deadlock leads
ruled out statically. Win+Linux build clean, golden 3/3; freeze re-test owed.
James Dansereau
d07ed0f2d0