irc: set local variable "filter" when doing /server raw xxx with raw buffer already opened (closes #1448)

ChangeLog.adoc

@@ -54,6 +54,7 @@ Bug fixes::
   * irc: fix display of message 350 (whois, gateway) (issue #1815)
   * irc: replace chars "\01" by spaces in CTCP replies (issue #1819)
   * irc: fix message when disconnecting from server in case of high lag when server option autoreconnect is off (issue #1708)
+  * irc: set local variable "filter" when doing `/server raw xxx` with raw buffer already opened (issue #1448)
   * guile: fix function hdata_get_string
   * javascript: fix return of long value in functions infolist_time, hdata_long and hdata_time
   * php: fix function hdata_compare

src/plugins/irc/irc-raw.c

@@ -423,6 +423,7 @@ irc_raw_set_filter (const char *filter)
         free (irc_raw_filter);
     irc_raw_filter = (filter && (strcmp (filter, "*") != 0)) ?
         strdup (filter) : NULL;
+    irc_raw_set_localvar_filter ();
 }
 
 /*