Updated mainly terminal filchooser from browser

system/programs/xdg.nix

@@ -2,7 +2,15 @@
   lib,
   pkgs,
   ...
-}: {
+}: let
+  # Patch termfilechooser .portal to add Niri to UseIn
+  termfilechooser-niri = pkgs.xdg-desktop-portal-termfilechooser.overrideAttrs (old: {
+    postFixup = (old.postFixup or "") + ''
+      substituteInPlace $out/share/xdg-desktop-portal/portals/termfilechooser.portal \
+        --replace-fail "wlroots;" "wlroots;Niri;"
+    '';
+  });
+in {
   xdg.portal = {
     enable = true;
     config = {
@@ -13,12 +21,14 @@
         "org.freedesktop.impl.portal.RemoteDesktop" = "gnome";
         "org.freedesktop.impl.portal.Secret" = ["gnome-keyring"];
         "org.freedesktop.impl.portal.OpenURI" = "gtk";
-        "org.freedesktop.impl.portal.OpenFile" = "gtk";
+        # FileChooser covers both OpenFile and SaveFile use-cases
+        "org.freedesktop.impl.portal.FileChooser" = "termfilechooser";
       };
     };
     extraPortals = [
       pkgs.xdg-desktop-portal-gtk
       pkgs.xdg-desktop-portal-gnome
+      termfilechooser-niri
     ];
   };