Please cage the mouse cursor to the render window while fullscreen on Windows. Otherwise, multi-monitor users can move their cursor off the game and click somewhere else (which shifts focus to whatever app/window they accidentally click on). Constraining the mouse cursor to one monitor is expected behavior for a fullscreen game. ClipCursor is the relevant function here... It's mostly a development annoyance, true, but more and more end-users are ending up with multiple monitors these days too.