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Created attachment 1521 [details]
Patch to fix Cocoa code for cancelled touches

In Mac OS X (10.9.1) when using my trackpad, touch finger presses are recognized correctly but sometimes SDL_FINGERUP isn't triggered when I remove my finger. This results in a buildup of "active" fingers (according to SDL).

This seems to happen when my trackpad finger movements are recognized as a global gesture by OS X (e.g. when I swipe several fingers up for exposé actions), and when I have fingers pressed on the trackpad when switching away from the SDL program with command-tab.

I believe I found a bug in SDL's Cocoa code which causes the latter case: Cocoa's NSTouchPhaseCancelled touch events aren't handled properly by SDL.

I've attached a patch which fixes that code and seems to fix the case where SDL_FINGERUP events aren't triggered properly when switching away from the SDL application, but it doesn't fix the case where SDL_FINGERUP events aren't triggered after doing a global OS X gesture with the SDL application active.