CMake: Use installed Qt's translations for packaging

cmake/Modules/FindQtTranslations.cmake

@@ -0,0 +1,25 @@
+# Return Qt translations files as list of paths
+# It will return .qm files of qt/qtbase that aren't stub files.
+# Requires that Qt has been found first because it depends on qmake being available
+
+function(qbt_get_qt_translations qt_translations)
+    get_target_property(QT_QMAKE_EXECUTABLE Qt::qmake IMPORTED_LOCATION)
+    execute_process(COMMAND "${QT_QMAKE_EXECUTABLE}" -query QT_INSTALL_TRANSLATIONS
+                    OUTPUT_VARIABLE QT_TRANSLATIONS_DIR OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+    FILE(GLOB QT_TEMP_TRANSLATIONS CONFIGURE_DEPENDS
+        "${QT_TRANSLATIONS_DIR}/qt_??.qm"
+        "${QT_TRANSLATIONS_DIR}/qt_??_??.qm"
+        "${QT_TRANSLATIONS_DIR}/qtbase_??.qm"
+        "${QT_TRANSLATIONS_DIR}/qtbase_??_??.qm")
+
+    foreach(TRANSLATION ${QT_TEMP_TRANSLATIONS})
+        FILE(SIZE "${TRANSLATION}" translation_size)
+        # Consider files less than 10KB as stub translations
+        if (translation_size GREATER_EQUAL 10240)
+            list(APPEND QT_FINAL_TRANSLATIONS "${TRANSLATION}")
+        endif()
+    endforeach()
+
+    SET(${qt_translations} ${QT_FINAL_TRANSLATIONS} PARENT_SCOPE)
+endfunction()

src/app/CMakeLists.txt

@@ -16,11 +16,6 @@ if (WEBUI)
         "${qBittorrent_BINARY_DIR}/src/webui/www/translations/webui_translations.qrc" COPYONLY)
 endif()
 
-FILE(GLOB QT_TRANSLATIONS "${qBittorrent_SOURCE_DIR}/dist/qt-translations/qtbase_*.qm")
-foreach(EXTRA_TRANSLATION IN ITEMS "fa" "gl" "lt" "pt" "sl" "sv" "zh_CN")
-    list(APPEND QT_TRANSLATIONS "${qBittorrent_SOURCE_DIR}/dist/qt-translations/qt_${EXTRA_TRANSLATION}.qm")
-endforeach()
-
 # Executable target configuration
 # -----------------------------------------------------------------------------
 # -----------------------------------------------------------------------------
@@ -65,6 +60,9 @@ endif()
 # Additional platform specific configuration
 # -----------------------------------------------------------------------------
 # -----------------------------------------------------------------------------
+if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    include(FindQtTranslations)
+    qbt_get_qt_translations(QT_TRANSLATIONS)
     set_source_files_properties(${QT_TRANSLATIONS} PROPERTIES MACOSX_PACKAGE_LOCATION translations)
     set_source_files_properties(
         "${qBittorrent_SOURCE_DIR}/dist/mac/qt.conf"
@@ -73,8 +71,6 @@ set_source_files_properties(
             PROPERTIES
                 MACOSX_PACKAGE_LOCATION Resources
     )
-
-if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
     # provide variables for substitution in dist/mac/Info.plist
     get_target_property(EXECUTABLE_NAME qbt_app OUTPUT_NAME)
     # This variable name should be changed once qmake is no longer used. Refer to the discussion in PR #14813