tag_client: Add explicit lua_State argument

tag_client() said that it refers to the tag ontop of the lua stack. However, it
implicitly used globalconf.L as its stack. So if you tagged a client with a tag
from a coroutine, thinks would Go Wrong (tm). Fix this by adding an explicit
lua_State* argument.

Signed-off-by: Uli Schlachter <psychon@znc.in>

objects/client.c

@@ -1384,7 +1384,7 @@ luaA_client_tags(lua_State *L)
         }
         lua_pushnil(L);
         while(lua_next(L, 2))
-            tag_client(c);
+            tag_client(L, c);
         lua_pop(L, 1);
     }
 

objects/tag.c

@@ -95,17 +95,18 @@ tag_client_emit_signal(lua_State *L, tag_t *t, client_t *c, const char *signame)
 }
 
 /** Tag a client with the tag on top of the stack.
+ * \param L The Lua VM state.
  * \param c the client to tag
  */
 void
-tag_client(client_t *c)
+tag_client(lua_State *L, client_t *c)
 {
-    tag_t *t = luaA_object_ref_class(globalconf.L, -1, &tag_class);
+    tag_t *t = luaA_object_ref_class(L, -1, &tag_class);
 
     /* don't tag twice */
     if(is_client_tagged(c, t))
     {
-        luaA_object_unref(globalconf.L, t);
+        luaA_object_unref(L, t);
         return;
     }
 
@@ -113,7 +114,7 @@ tag_client(client_t *c)
     ewmh_client_update_desktop(c);
     banning_need_update();
 
-    tag_client_emit_signal(globalconf.L, t, c, "tagged");
+    tag_client_emit_signal(L, t, c, "tagged");
 }
 
 /** Untag a client with specified tag.
@@ -218,7 +219,7 @@ luaA_tag_clients(lua_State *L)
             client_t *c = luaA_checkudata(L, -1, &client_class);
             /* push tag on top of the stack */
             lua_pushvalue(L, 1);
-            tag_client(c);
+            tag_client(L, c);
             lua_pop(L, 1);
         }
     }

objects/tag.h

@@ -25,7 +25,7 @@
 #include "client.h"
 
 int tags_get_first_selected_index(void);
-void tag_client(client_t *);
+void tag_client(lua_State *, client_t *);
 void untag_client(client_t *, tag_t *);
 bool is_client_tagged(client_t *, tag_t *);
 void tag_unref_simplified(tag_t **);