pantheon.elementary-feedback: load metadata from correct location

pkgs/desktops/pantheon/apps/elementary-feedback/default.nix

@@ -27,6 +27,14 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-YLYHaFQAAeSt25xHF7xDJWhw+rbH9SpzoRoXaYP42jg=";
   };
 
+  patches = [
+    # The standard location to the metadata pool where metadata
+    # will be read from is likely hardcoded as /usr/share/metainfo
+    # https://github.com/ximion/appstream/blob/v0.15.2/src/as-pool.c#L117
+    # https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#spec-component-location
+    ./fix-metadata-path.patch
+  ];
+
   nativeBuildInputs = [
     meson
     ninja

pkgs/desktops/pantheon/apps/elementary-feedback/fix-metadata-path.patch

@@ -0,0 +1,17 @@
+diff --git a/src/MainWindow.vala b/src/MainWindow.vala
+index 6fee9d3..b0eb28c 100644
+--- a/src/MainWindow.vala
++++ b/src/MainWindow.vala
+@@ -89,6 +89,12 @@ public class Feedback.MainWindow : Gtk.ApplicationWindow {
+ #endif
+             }
+ 
++#if HAS_APPSTREAM_0_15
++            appstream_pool.add_extra_data_location ("/run/current-system/sw/share/metainfo/", AppStream.FormatStyle.METAINFO);
++#else
++            appstream_pool.add_metadata_location ("/run/current-system/sw/share/metainfo/");
++#endif
++
+             // flatpak's appstream files exists only inside they sandbox
+             unowned var appdata_dir = "/var/lib/flatpak/app/%s/current/active/files/share/appdata";
+             foreach (var app in app_entries) {