[libadwaita/wip/exalm/demo: 5/12] demo: Expose desktop file in flatpak

[Alexander Mikhaylenko <alexm src gnome org>]

commit 7d57688d1f9d26f10a59e389ff62f4ca6a43b634
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Oct 13 16:03:22 2021 +0500

    demo: Expose desktop file in flatpak
    
    Copied from https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/2932

 demo/org.gnome.Adwaita1.Demo.json | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/demo/org.gnome.Adwaita1.Demo.json b/demo/org.gnome.Adwaita1.Demo.json
index 6dbb8627..f42c30b6 100644
--- a/demo/org.gnome.Adwaita1.Demo.json
+++ b/demo/org.gnome.Adwaita1.Demo.json
@@ -39,6 +39,9 @@
       "name": "libadwaita",
       "buildsystem": "meson",
       "builddir": true,
+      "post-install" : [
+          "desktop-file-edit --remove-key=NoDisplay 
${FLATPAK_DEST}/share/applications/org.gnome.Adwaita1.Demo.desktop"
+      ],
       "sources": [
         {
           "type": "git",