INTERNAL_BORDER_TOP_LEFT_CORNER 2508 src/frame.c    	     part = INTERNAL_BORDER_TOP_LEFT_CORNER;
INTERNAL_BORDER_TOP_LEFT_CORNER 2524 src/frame.c    	     part = INTERNAL_BORDER_TOP_LEFT_CORNER;
INTERNAL_BORDER_TOP_LEFT_CORNER 35170 src/xdisp.c    	case INTERNAL_BORDER_TOP_LEFT_CORNER: