implemented Button2 press on tags for toggletag on the focused client

event.c

@@ -109,10 +109,17 @@ buttonpress(XEvent *e)
 		for(a.i = 0; a.i < ntags; a.i++) {
 			x += textw(tags[a.i]);
 			if(ev->x < x) {
-				if(ev->button == Button1)
+				switch(ev->button) {
+				case Button1:
 					view(&a);
-				else if(ev->button == Button3)
+					break;
+				case Button2:
+					toggletag(&a);
+					break;
+				case Button3:
 					toggleview(&a);
+					break;
+				}
 				return;
 			}
 		}