Fixed bug 2550 - [OS X 10.9] Enabling SDL_WINDOW_FULLSCREEN after relative mouse mode leaves cursor visible

 Eric Wasylishen

Steps to reproduce:

- Run testwm2 app in the SDLTest Xcode project
- Press Control+R to enable relative mouse mode. The mouse cursor should disappear.
- Press Control+Enter to enter fullscreen.
- Expected: a black screen with no cursor visible. Observed: a black screen, but the mouse cursor is visible in the middle of the screen. It doesn't move when I move the mouse.

Reproduced with latest sdl2 hg (changeset f6010ead184f) on OS X 10.9.2. Can't reproduce the problem on OS X 10.6.8 or 10.7.5.

I'm speculating that this really an Apple bug.. but anyway, the attached workaround seems to fix it for me, and I think it's fairly safe.

A more obvious idea, sticking a call SDL_SetCursor(NULL) at the end of Cocoa_SetWindowFullscreen, didn't work.

src/video/cocoa/SDL_cocoamouse.m

@@ -271,6 +271,15 @@ Cocoa_SetRelativeMouseMode(SDL_bool enabled)
     if (result != kCGErrorSuccess) {
         return SDL_SetError("CGAssociateMouseAndMouseCursorPosition() failed");
     }
+
+    /* The hide/unhide calls are redundant most of the time, but they fix
+     * https://bugzilla.libsdl.org/show_bug.cgi?id=2550
+     */
+    if (enabled) {
+        [NSCursor hide];
+    } else {
+        [NSCursor unhide];
+    }
     return 0;
 }