element-desktop: add commandLineArgs (#345453)

pkgs/applications/networking/instant-messengers/element/element-desktop.nix

@@ -17,6 +17,8 @@
 , CoreServices
 , desktopToDarwinBundle
 , useKeytar ? true
+# command line arguments which are always set
+, commandLineArgs ? ""
 }:
 
 let
@@ -106,7 +108,8 @@ stdenv.mkDerivation (finalAttrs: builtins.removeAttrs pinData [ "hashes" ] // {
     makeWrapper '${electron}/bin/electron' "$out/bin/${executableName}" \
       --set LD_PRELOAD ${sqlcipher}/lib/libsqlcipher.so \
       --add-flags "$out/share/element/electron" \
-      --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations}}"
+      --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations}}" \
+      --add-flags ${lib.escapeShellArg commandLineArgs}
 
     runHook postInstall
   '';