qt6.qtbase: backport fix for HTTP/2 stream corruption (#428127)

pkgs/development/libraries/qt-6/modules/qtbase/default.nix

@@ -80,6 +80,7 @@
   libinput,
   # options
   qttranslations ? null,
+  fetchpatch,
 }:
 
 let
@@ -217,6 +218,13 @@ stdenv.mkDerivation rec {
     ./qmlimportscanner-import-path.patch
     # don't pass qtbase's QML directory to qmlimportscanner if it's empty
     ./skip-missing-qml-directory.patch
+
+    # Backport patch recommended by KDE to fix HTTP2 stream corruption issues
+    # FIXME: remove in 6.9.2
+    (fetchpatch {
+      url = "https://invent.kde.org/qt/qt/qtbase/-/commit/904aec2f372e2981af19bf762583a0ef42ec6bb9.diff";
+      hash = "sha256-bSf4TgYUk7Ariu37NHGQKv6wFArVpQLlnHCTbCFzAfI=";
+    })
   ];
 
   postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''