implemented maxclient property for areas, the default is now, that first column has maxclient==1 (though if detached things still don't behave like I want it, detaching from maxclient column should fetch from next column a client if possible)

cmd/wm/area.c

@@ -95,7 +95,7 @@ select_area(Area *a, char *arg)
 }
 
 void
-sendto_area(Area *new, Client *c)
+sendto_area(Area *to, Client *c)
 {
 	Area *a = c->area;
 
@@ -104,12 +104,39 @@ sendto_area(Area *new, Client *c)
 	if(a->sel >= a->nclient)
 		a->sel = 0;
 
-	new->client = (Client **)cext_array_attach(
+	attach_client2area(to, c);
-			(void **)new->client, c, sizeof(Client *), &new->clientsz);
-	new->nclient++;
-
-	c->area = new;
-	arrange_column(a);
-	arrange_column(new);
 	focus_client(c);
 }
+
+void
+attach_client2area(Area *a, Client *c)
+{
+	Page *p = a->page;
+	if(area2index(a) && a->maxclient && (a->maxclient == a->nclient)) {
+		Area *to = nil;
+		int i;
+		for(i = p->sel; i < p->narea; i++) {
+			to = p->area[i];
+			if(!to->maxclient || (to->maxclient > to->nclient))
+				break;
+			to = nil;
+		}
+		if(!to) {
+			to = alloc_area(p);
+			sendto_area(to, a->client[a->sel]);
+			arrange_page(p, True);
+		}
+		else
+			sendto_area(to, a->client[a->sel]);
+	}
+
+	a->client = (Client **)cext_array_attach(
+			(void **)a->client, c, sizeof(Client *), &a->clientsz);
+	a->nclient++;
+	c->area = a;
+	if(p->sel > 0) /* column mode */
+		arrange_column(a);
+	else /* normal mode */
+		resize_client(c, &c->frame.rect, nil, False);
+}
+

cmd/wm/client.c

@@ -352,14 +352,7 @@ attach_client2page(Page *p, Client *c)
 	Area *a = p->area[p->sel];
 
     reparent_client(c, c->frame.win, c->rect.x, c->rect.y);
-	a->client = (Client **)cext_array_attach((void **)a->client, c,
+	attach_client2area(a, c);
-			sizeof(Client *), &a->clientsz);
-	a->nclient++;
-	c->area = a;
-	if(p->sel > 0) /* column mode */
-		arrange_column(a);
-	else /* normal mode */
-		resize_client(c, &c->frame.rect, nil, False);
     map_client(c);
 	XMapWindow(dpy, c->frame.win);
 }
@@ -566,7 +559,7 @@ select_client(Client *c, char *arg)
 void
 sendtopage_client(Client *c, char *arg) {
 	Page *p;
-	Client *next;
+	Client *to;
 
 	if(!strncmp(arg, "new", 4))
 		p = alloc_page();
@@ -583,14 +576,14 @@ sendtopage_client(Client *c, char *arg) {
 	attach_client2page(p, c);
 	if(p == page[sel])
 		focus_client(c);
-	else if((next = sel_client_of_page(page[sel])))
+	else if((to = sel_client_of_page(page[sel])))
-		focus_client(next);
+		focus_client(to);
 }
 
 void
 sendtoarea_client(Client *c, char *arg) {
 	const char *errstr;
-	Area *next, *a = c->area;
+	Area *to, *a = c->area;
 	Page *p = a->page;
 	int i = area2index(a);
 
@@ -598,23 +591,24 @@ sendtoarea_client(Client *c, char *arg) {
 		return;
 	if(!strncmp(arg, "prev", 5)) {
 		if(i == 1)
-			next = p->area[p->narea - 1];
+			to = p->area[p->narea - 1];
 		else
-			next = p->area[i - 1];
+			to = p->area[i - 1];
 	}
 	else if(!strncmp(arg, "next", 5)) {
 		if(i < p->narea - 1)
-			next = p->area[i + 1];
+			to = p->area[i + 1];
 		else
-			next = p->area[1];
+			to = p->area[1];
 	}
 	else {
 		i = cext_strtonum(arg, 0, p->narea - 1, &errstr);
 		if(errstr)
 			return;
-		next = p->area[i];
+		to = p->area[i];
 	}
-	sendto_area(next, c);
+	sendto_area(to, c);
+	arrange_column(to);
 }
 
 void

cmd/wm/column.c

@@ -232,8 +232,10 @@ drop_moving(Client *c, XRectangle *new, XPoint * pt)
 	for(i = 1; (i < p->narea) &&
 			!blitz_ispointinrect(pt->x, pt->y, &p->area[i]->rect); i++);
 	if((tgt = ((i < p->narea) ? p->area[i] : nil))) {
-        if(tgt != src)
+        if(tgt != src) {
 			sendto_area(tgt, c);
+			arrange_column(tgt);
+		}
         else {
 			for(i = 0; (i < src->nclient) &&
 				 !blitz_ispointinrect(pt->x, pt->y, &src->client[i]->frame.rect); i++);

cmd/wm/page.c

@@ -18,7 +18,7 @@ alloc_page()
 
 	p->id = id++;
 	alloc_area(p);
-	alloc_area(p);
+	alloc_area(p)->maxclient = 1; /* default column is master */
 	page = (Page **)cext_array_attach((void **)page, p, sizeof(Page *), &pagesz);
 	npage++;
 	focus_page(p);

cmd/wm/wm.h

@@ -195,7 +195,8 @@ int area2index(Area *a);
 int aid2index(Page *p, unsigned short id);
 void update_area_geometry(Area *a);
 void select_area(Area *a, char *arg);
-void sendto_area(Area *new, Client *c);
+void sendto_area(Area *to, Client *c);
+void attach_client2area(Area *a, Client *c);
 
 /* bar.c */
 Label *new_label();