Add option (tag_auto_prev) in wmfsrc to disable the auto tag prev

when going twice on the same tag.

src/config.c

@@ -470,6 +470,7 @@ conf_tag_section(void)
      sec = fetch_section_first(NULL, "tags");
 
      conf.tag_round               = fetch_opt_first(sec, "false", "tag_round").bool;
+     conf.tag_auto_prev           = fetch_opt_first(sec, "true", "tag_auto_prev").bool;
      conf.colors.tagselfg         = fetch_opt_first(sec, "#ffffff", "sel_fg").str;
      conf.colors.tagselbg         = getcolor(fetch_opt_first(sec, "#000000", "sel_bg").str);
      conf.colors.tagurfg          = fetch_opt_first(sec, "#000000", "urgent_fg").str;

src/structs.h

@@ -480,6 +480,7 @@ typedef struct
      Rule *rule;
      int *ntag;
      Bool tag_round;
+     Bool tag_auto_prev;
      Bool client_round;
      Bool layout_system; /* Switch: False, Menu: True. */
      Bool layout_placement; /* Right (normal): False, Left: True. */

src/tag.c

@@ -49,7 +49,7 @@ tag_set(int tag)
 
      if(seltag[selscreen] != tag)
           prevseltag[selscreen] = seltag[selscreen];
-     else if(tag == seltag[selscreen] && tag != prevseltag[selscreen])
+     else if(tag == seltag[selscreen] && tag != prevseltag[selscreen] && conf.tag_auto_prev)
           tag = seltag[selscreen] = prevseltag[selscreen];
      else
           seltag[selscreen] = tag;