Adjust gnome-flashback for trisquel-gnome

Fix gnome-menus install conflict.

helpers/make-gnome-flashback

@@ -0,0 +1,36 @@
+#!/bin/sh
+#
+#    Copyright (C) 2022 Trisquel GNU/Linux developers
+#                       <trisquel-devel@listas.trisquel.info>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+VERSION=0
+
+. ./config
+
+#Remove pre-installed menu by gnome-menus' trisquel package
+rm data/menus/gnome-flashback-applications.menu
+sed -i '/etc\/xdg\/menus/d' debian/gnome-flashback-common.install
+sed -i '/gnome-flashback-applications.menu/d' data/menus/Makefile.am
+sed -i '/gnome-flashback-applications.menu/d' data/menus/Makefile.in
+
+#Install flashback as default x-session-manager (above 50).
+sed -i '/metacity/s|40|60|' debian/gnome-session-flashback.postinst
+
+changelog "Prevent conflict for pre-installed menu layout."
+
+compile