Add nickname fallback for rooms that don't have XEP-0421

gtk-helpers.go

@@ -67,6 +67,10 @@ func switchToTab(jid string, w *gtk.Window) {
 			var ocu OccupantID
 			u.Get(&mu)
 			u.Get(&ocu)
+			id := ocu.ID
+			if id == "" {
+				id = JidMustParse(u.From).Resource
+			}
 
 			nick_label := gtk.NewLabel(JidMustParse(u.From).Resource)
 			nick_label.SetEllipsize(pango.EllipsizeEnd)
@@ -176,7 +180,7 @@ func switchToTab(jid string, w *gtk.Window) {
 					mo, _ := mucmembers.Load(JidMustParse(u.From).Bare())
 					mm := mo.(mucUnit)
 					mmm := mm.Members
-					mmmm, ok := mmm.Load(ocu.ID)
+					mmmm, ok := mmm.Load(id)
 					if ok {
 						pres := mmmm.(stanza.Presence)