applied Hiltjos' BUGS patch from 23 Mar, sorry took a while :)

BUGS

@@ -25,13 +25,6 @@ reproducible with xrandr -s but not with --output and --mode, strange
 
 ---
 
-> another corner case:
-
-a tiled client can be resized with mod+right click, but it only works
-on the main monitor
-
----
-
 dmenu appears on the monitor where the pointer is and not on selmon
 
 ---

dwm.c

@@ -1202,7 +1202,7 @@ movemouse(const Arg *arg) {
 		case MotionNotify:
 			nx = ocx + (ev.xmotion.x - x);
 			ny = ocy + (ev.xmotion.y - y);
-			if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
+			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
 			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
 				if(abs(selmon->wx - nx) < snap)
 					nx = selmon->wx;