ClangFormat: Start to use new file management

- Indenter uses .clang-format file from a dir of
editing file or from a parent dir. If there is no
such file then indenter starts to use file from a dir
with the name current CodeStyle settings.
- Test fixed

ToDo: Add file absentness processing in case of import

Change-Id: If09ef0c598899856b948c214e524bcfd5dad76e2
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangformat/clangformatconfigwidget.cpp

@@ -113,11 +113,8 @@ ClangFormatConfigWidget::ClangFormatConfigWidget(TextEditor::ICodeStylePreferenc
     m_ui->setupUi(this);
     setEnabled(!codeStyle->isReadOnly());
 
-    Utils::FilePath filePath = Core::ICore::userResourcePath();
-    filePath = filePath / "clang-format/"
-               / Utils::FileUtils::fileSystemFriendlyName(codeStyle->displayName())
-               / QLatin1String(Constants::SETTINGS_FILE_NAME);
-    m_config = std::make_unique<ClangFormatFile>(filePath, codeStyle->isReadOnly());
+    m_config = std::make_unique<ClangFormatFile>(filePathToCurrentSettings(codeStyle),
+                                                 codeStyle->isReadOnly());
 
     initChecksAndPreview();
     showCombobox();