Fix double toggling of full screen and fix potential issue if 'q' was bound to do something and the user was really trying to quit without doing whatever that was. Both of these were OS X specific issues due to the fact that Quit and Enter Full Screen are two menu options and handled as such.

stepmania/src/StepMania.cpp

@@ -1266,6 +1266,16 @@ bool HandleGlobalInputs( const InputEventPlus &input )
 			return true;
 		}
 	}
+#else
+	if( input.DeviceI == DeviceInput(DEVICE_KEYBOARD, KEY_Cq) &&
+	    (INPUTFILTER->IsBeingPressed( DeviceInput(DEVICE_KEYBOARD, KEY_LMETA) ) ||
+	     INPUTFILTER->IsBeingPressed( DeviceInput(DEVICE_KEYBOARD, KEY_RMETA) )) )
+	{
+		/* The user quit is handled by the menu item so we don't need to set it here;
+		 * however, we do want to return that it has been handled since this will happen
+		 * first. */
+		return true;
+	}
 #endif
 
 	bool bDoScreenshot = 
@@ -1300,7 +1310,14 @@ bool HandleGlobalInputs( const InputEventPlus &input )
 		 INPUTFILTER->IsBeingPressed(DeviceInput(DEVICE_KEYBOARD, KEY_LALT))) )
 	{
 		/* alt-enter */
+		/* In OS X, this is a menu item and will be handled as such. This will happen
+		 * first and then the lower priority GUI thread will happen second causing the
+		 * window to toggle twice. Another solution would be to put a timer in
+		 * ArchHooks::SetToggleWindowed() and just not set the bool it if it's been less
+		 * than, say, half a second. */
+#if !defined(MACOSX)
 		ArchHooks::SetToggleWindowed();
+#endif
 		return true;
 	}