[#2440] Added a case in mainwindow to avoid performing actions on tab entry

sflphone-client-gnome/src/mainwindow.c

@@ -114,6 +114,7 @@ on_key_released (GtkWidget *widget, GdkEventKey *event, gpointer user_data UNUSE
 				event->keyval == 60             || // <
 				event->keyval == 62             || // >
 				event->keyval == 34             || // "
+		                event->keyval == 65289          || // tab
 				event->keyval == 65361          || // left arrow
 				event->keyval == 65363          || // right arrow
 				event->keyval >= 65470          || // F-keys