I work with enabled RESIZEHINTS, simply because I force myself to continue the st development ;)

config.arg.h

@@ -31,7 +31,7 @@ static Layout layouts[] = { \
 	{ "[]=",		tile }, /* first entry is default */ \
 	{ "><>",		floating }, \
 };
-#define RESIZEHINTS		False	/* True - respect size hints in tiled resizals */
+#define RESIZEHINTS		True	/* False - respect size hints in tiled resizals */
 #define MWFACT			0.6	/* master width factor [0.1 .. 0.9] */
 #define SNAP			32	/* snap pixel */