record-row: Only popup context menu if row is realized

This works around the long press gesture
(mis?) firing the "press" signal on a
row that is not realized anymore
(because the slice model in the history box
 currently rebuilds all rows when the items change).

Fixes: https://gitlab.gnome.org/GNOME/calls/-/issues/666
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/755>

src/calls-call-record-row.c

@@ -384,6 +384,11 @@ on_long_pressed (GtkGestureLongPress *gesture,
                  gdouble              y,
                  GtkWidget           *self)
 {
+  if (!gtk_widget_get_realized (self)) {
+    g_warning ("widget is not realized, why does it emit 'pressed'? Aborting..");
+    return;
+  }
+
   context_menu (self, NULL);
 }