NO_KEY            126 modules/highgui/src/window_carbon.cpp static char lastKey = NO_KEY;
NO_KEY           1086 modules/highgui/src/window_carbon.cpp         lastKey = NO_KEY;
NO_KEY           1111 modules/highgui/src/window_carbon.cpp     while (lastKey == NO_KEY  &&  theEvent.what != nullEvent);
NO_KEY           1114 modules/highgui/src/window_carbon.cpp     lastKey = NO_KEY;