gnomeExtensions: fix ddterm

It needs gjs, zenity & vte.

Fixes #125363.

pkgs/desktops/gnome/extensions/extensionOverrides.nix

@@ -1,8 +1,12 @@
 { lib
 , ddcutil
 , gjs
+, gnome
+, gobject-introspection
 , xprop
 , touchegg
+, vte
+, wrapGAppsHook
 }:
 let
   # Helper method to reduce redundancy
@@ -25,6 +29,21 @@ super: lib.trivial.pipe super [
     meta.maintainers = with lib.maintainers; [ eperuffo jtojnar rhoriguchi ];
   }))
 
+  (patchExtension "ddterm@amezin.github.com" (old: {
+    # Requires gjs, zenity & vte via the typelib
+    nativeBuildInputs = [ gobject-introspection wrapGAppsHook ];
+    buildInputs = [ vte ];
+    postPatch = ''
+      for file in *.js com.github.amezin.ddterm; do
+        substituteInPlace $file --replace "gjs" "${gjs}/bin/gjs"
+        substituteInPlace $file --replace "zenity" "${gnome.zenity}/bin/zenity"
+      done
+    '';
+    postFixup = ''
+      wrapGApp "$out/share/gnome-shell/extensions/ddterm@amezin.github.com/com.github.amezin.ddterm"
+    '';
+  }))
+
   (patchExtension "display-brightness-ddcutil@themightydeity.github.com" (old: {
     # Has a hard-coded path to a run-time dependency
     # https://github.com/NixOS/nixpkgs/issues/136111