applied lolilolicon's floating center patch, further investigation wrt his second issue reported needed

dwm.c

@@ -632,9 +632,9 @@ configurerequest(XEvent *e) {
 				c->h = ev->height;
 			}
 			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
-				c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
+				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 			if((c->y + c->h) > m->my + m->mh && c->isfloating)
-				c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
+				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 				configure(c);
 			if(ISVISIBLE(c))