trigger: fix variables sent to focus callback (closes #1858)

This fixes a regression introduced in WeeChat 3.7 by commit
0f67f55098.

ChangeLog.adoc

@@ -37,6 +37,7 @@ Bug fixes::
   * api: fix function string_cut when there are non printable chars in suffix
   * api: do not expect any return value in callbacks "callback_change" and "callback_delete" of function config_new_option (scripting API)
   * irc: escape backslashes in raw buffer (issue #1838)
+  * trigger: fix variables sent to focus callback (issue #1858)
 
 Tests::
 

src/plugins/trigger/trigger-callback.c

@@ -1385,6 +1385,8 @@ trigger_callback_focus_cb (const void *pointer, void *data,
 
     TRIGGER_CALLBACK_CB_NEW_POINTERS;
 
+    ctx.extra_vars = weechat_hashtable_dup (info);
+
     /* add data in hashtables used for conditions/replace/command */
     trigger_callback_set_common_vars (trigger, info);
     ptr_value = weechat_hashtable_get (info, "_window");