Client: Add focusontag option in Client structure to save focused client on every tag

src/client.c

@@ -340,6 +340,7 @@ client_above(Client *c)
 void
 client_focus(Client *c)
 {
+     Client *cc;
      Window w;
      int d;
 
@@ -365,6 +366,14 @@ client_focus(Client *c)
           c->colors.frame = conf.client.borderfocus;
           c->colors.fg = conf.titlebar.fg_focus;
           c->colors.resizecorner = conf.client.resizecorner_focus;
+
+          /* Set focusontag option */
+          for(cc = clients; cc; cc = cc->next)
+               if(cc->focusontag == c->tag)
+                    cc->focusontag = -1;
+
+          c->focusontag = seltag[selscreen];
+
           if(TBARH - BORDH && c->titlebar->stipple)
                c->titlebar->stipple_color = conf.titlebar.stipple.colors.focus;
           frame_update(c);
@@ -689,6 +698,7 @@ client_manage(Window w, XWindowAttributes *wa, Bool ar)
      c->ogeo.height = c->geo.height = wa->height;
      c->free_geo = c->geo;
      c->tag = seltag[c->screen];
+     c->focusontag = -1;
 
      c->layer = (sel && sel->layer > 0) ? sel->layer : 1;
 

src/mouse.c

@@ -102,6 +102,8 @@ mouse_move_tag_client(Client *c)
                     arrange(c->screen, True);
           }
 
+     client_focus_next(c);
+
      return;
 }
 

src/structs.h

@@ -184,6 +184,7 @@ struct Client
      char *title;
      /* Tag num */
      uint tag;
+     int focusontag;
      /* Screen */
      int screen;
      /* Layer */

src/tag.c

@@ -105,11 +105,17 @@ tag_set(int tag)
           tags[selscreen][tag].request_update = False;
      }
 
-     /* To focus the first client in the new tag */
+     /* To focus selected client of the via focusontag option */
      for(c = clients; c; c = c->next)
-          if(c->tag == seltag[selscreen] && c->screen == selscreen)
+          if(c->focusontag == tag && c->screen == selscreen)
                break;
 
+     /* No focusontag option found on any client, try to find the first of the tag */
+     if(!c)
+          for(c = clients; c; c = c->next)
+               if(c->tag == seltag[selscreen] && c->screen == selscreen)
+                    break;
+
      client_focus((c) ? c : NULL);
 
      return;