Add option to display MUC name or JID in titlebar

Add `/titlebar use [name|jid]`.

src/config/preferences.c

@@ -1719,6 +1719,7 @@ _get_group(preference_t pref)
         case PREF_STATUSBAR_SELF:
         case PREF_STATUSBAR_CHAT:
         case PREF_STATUSBAR_ROOM:
+        case PREF_TITLEBAR_MUC_TITLE:
             return PREF_GROUP_UI;
         case PREF_STATES:
         case PREF_OUTTYPE:
@@ -1961,6 +1962,8 @@ _get_key(preference_t pref)
             return "inpblock.dynamic";
         case PREF_ENC_WARN:
             return "enc.warn";
+        case PREF_TITLEBAR_MUC_TITLE:
+            return "titlebar.muc.title";
         case PREF_PGP_LOG:
             return "log";
         case PREF_TLS_CERTPATH:
@@ -2087,6 +2090,8 @@ _get_default_string(preference_t pref)
             return "none";
         case PREF_ROSTER_ROOMS_USE_AS_NAME:
             return "name";
+        case PREF_TITLEBAR_MUC_TITLE:
+            return "name";
         case PREF_ROSTER_ROOMS_ORDER:
             return "name";
         case PREF_ROSTER_ROOMS_UNREAD:

src/config/preferences.h

@@ -137,6 +137,7 @@ typedef enum {
     PREF_RESOURCE_MESSAGE,
     PREF_INPBLOCK_DYNAMIC,
     PREF_ENC_WARN,
+    PREF_TITLEBAR_MUC_TITLE,
     PREF_PGP_LOG,
     PREF_TLS_CERTPATH,
     PREF_TLS_SHOW,

src/config/theme.c

@@ -309,6 +309,7 @@ _load_preferences(void)
     _set_boolean_preference("presence", PREF_PRESENCE);
     _set_boolean_preference("intype", PREF_INTYPE);
     _set_boolean_preference("enc.warn", PREF_ENC_WARN);
+    _set_boolean_preference("titlebar.muc.title", PREF_TITLEBAR_MUC_TITLE);
     _set_boolean_preference("tls.show", PREF_TLS_SHOW);
     _set_boolean_preference("statusbar.show.name", PREF_STATUSBAR_SHOW_NAME);
     _set_boolean_preference("statusbar.show.number", PREF_STATUSBAR_SHOW_NUMBER);