kdePackages.extra-cmake-modules: hack search paths into ECMFindQtModule

pkgs/kde/frameworks/extra-cmake-modules/default.nix

@@ -7,6 +7,10 @@ mkKdeDerivation {
 
   outputs = [ "out" ];
 
+  patches = [
+    ./search-qml.patch
+  ];
+
   # Packages that have an Android APK (e.g. KWeather) require Python3 at build time.
   # See: https://invent.kde.org/frameworks/extra-cmake-modules/-/blob/v6.1.0/modules/ECMAddAndroidApk.cmake?ref_type=tags#L57
   propagatedNativeBuildInputs = [

pkgs/kde/frameworks/extra-cmake-modules/ecm-hook.sh

@@ -5,6 +5,9 @@
 ecmEnvHook() {
     addToSearchPath XDG_DATA_DIRS "$1/share"
     addToSearchPath XDG_CONFIG_DIRS "$1/etc/xdg"
+    if [ -n "${qtQmlPrefix-}" ]; then
+      addToSearchPath NIXPKGS_QML_SEARCH_PATHS "$1/$qtQmlPrefix"
+    fi
 }
 addEnvHooks "$hostOffset" ecmEnvHook
 

pkgs/kde/frameworks/extra-cmake-modules/search-qml.patch

@@ -0,0 +1,15 @@
+diff --git a/modules/ECMFindQmlModule.cmake.in b/modules/ECMFindQmlModule.cmake.in
+index 7db160c1..03fa6916 100644
+--- a/modules/ECMFindQmlModule.cmake.in
++++ b/modules/ECMFindQmlModule.cmake.in
+@@ -15,8 +15,8 @@ if (QT_MAJOR_VERSION EQUAL "6")
+     include(${ECM_MODULE_DIR}/ECMQmlModule.cmake)
+     # Get the qmldir file
+     _ecm_qmlmodule_uri_to_path(MODULEDIR "@MODULE_NAME@" "@VERSION@")
+-    set(KDE_QMLDIR "${KDE_INSTALL_FULL_QMLDIR}/${MODULEDIR}")
+-    find_file(QMLDIR_FILE qmldir ${KDE_QMLDIR} NO_CACHE)
++    find_file(QMLDIR_FILE qmldir PATHS ENV NIXPKGS_QML_SEARCH_PATHS PATH_SUFFIXES ${MODULEDIR} NO_CACHE NO_DEFAULT_PATHS)
++    cmake_path(GET QMLDIR_FILE PARENT_PATH KDE_QMLDIR)
+     if (NOT QMLDIR_FILE) # Check the install destination, the QT_PLUGIN_PATH might not be set up correctly at this point
+         # Check the Qt installation
+         ecm_query_qt(qt_qml_dir QT_INSTALL_QML)