added attach/detach functions which don't attach at the begin of list, but at the slot of a first match of the tags of a client

client.c

@@ -230,13 +230,7 @@ manage(Window w, XWindowAttributes *wa)
 			DefaultVisual(dpy, screen),
 			CWOverrideRedirect | CWBackPixmap | CWEventMask, &twa);
 
-	if(clients)
-		clients->prev = c;
-	c->next = clients;
-	clients = c;
-
 	grabbuttons(c, False);
-
 	if((tc = getclient(trans))) /* inherit tags */
 		for(i = 0; i < ntags; i++)
 			c->tags[i] = tc->tags[i];
@@ -246,6 +240,9 @@ manage(Window w, XWindowAttributes *wa)
 		c->isfloat = trans
 			|| (c->maxw && c->minw &&
 				c->maxw == c->minw && c->maxh == c->minh);
+
+	attach(c);
+
 	settitle(c);
 	if(isvisible(c))
 		sel = c;
@@ -407,12 +404,7 @@ unmanage(Client *c)
 	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 	XDestroyWindow(dpy, c->twin);
 
-	if(c->prev)
-		c->prev->next = c->next;
-	if(c->next)
-		c->next->prev = c->prev;
-	if(c == clients)
-		clients = c->next;
+	detach(c);
 	if(sel == c) {
 		if(trans && (tc = getclient(trans)) && isvisible(tc))
 			sel = tc;

dwm.h

@@ -127,6 +127,8 @@ extern void *erealloc(void *ptr, unsigned int size);
 extern void spawn(Arg *arg);
 
 /* view.c */
+extern void attach(Client *c);
+extern void detach(Client *c);
 extern void dofloat(Arg *arg);
 extern void dotile(Arg *arg);
 extern void focusnext(Arg *arg);

view.c

@@ -8,6 +8,45 @@
 
 void (*arrange)(Arg *) = DEFMODE;
 
+void
+attach(Client *c)
+{
+	Client *first = getnext(clients);
+
+	if(!first) {
+		if(clients) {
+			for(first = clients; first->next; first = first->next);
+			first->next = c;
+			c->prev = first;
+		}
+		else
+			clients = c;
+	}
+	else if(first == clients) {
+		c->next = clients;
+		clients->prev = c;
+		clients = c;
+	}
+	else {
+		first->prev->next = c;
+		c->prev = first->prev;
+		first->prev = c;
+		c->next = first;
+	}
+}
+
+void
+detach(Client *c)
+{
+	if(c->prev)
+		c->prev->next = c->next;
+	if(c->next)
+		c->next->prev = c->prev;
+	if(c == clients)
+		clients = c->next;
+	c->next = c->prev = NULL;
+}
+
 void
 dofloat(Arg *arg)
 {
@@ -228,26 +267,16 @@ view(Arg *arg)
 void
 zoom(Arg *arg)
 {
-	Client *c;
+	Client *c = sel;
 
-	if(!sel || (arrange != dotile) || sel->isfloat || sel->ismax)
+	if(!c || (arrange != dotile) || c->isfloat || c->ismax)
 		return;
 
-	if(sel == getnext(clients))  {
-		if((c = getnext(sel->next)))
-			sel = c;
-		else
+	if(c == getnext(clients))
+		if(!(c = getnext(c->next)))
 			return;
-	}
-
-	/* pop */
-	sel->prev->next = sel->next;
-	if(sel->next)
-		sel->next->prev = sel->prev;
-	sel->prev = NULL;
-	clients->prev = sel;
-	sel->next = clients;
-	clients = sel;
-	focus(sel);
+	detach(c);
+	attach(c);
+	focus(c);
 	arrange(NULL);
 }