IsFunctionKey    6522 src/gtkutil.c         || IsFunctionKey (keysym)	/* 0xffbe <= x < 0xffe1 */
IsFunctionKey    5353 src/pgtkterm.c 	   || IsFunctionKey (keysym)	/* 0xffbe <= x < 0xffe1 */
IsFunctionKey    20444 src/xterm.c    	       || IsFunctionKey (keysym) /* 0xffbe <= x < 0xffe1 */
IsFunctionKey    24300 src/xterm.c    		       || IsFunctionKey (keysym) /* 0xffbe <= x < 0xffe1 */