diff --git a/src/plugins/clangformat/clangformatglobalconfigwidget.cpp b/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
index ac1cae84742..f6e04576919 100644
--- a/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
+++ b/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
@@ -3,14 +3,21 @@
 
 #include "clangformatglobalconfigwidget.h"
 
+#include "clangformatconfigwidget.h"
 #include "clangformatconstants.h"
+#include "clangformatindenter.h"
 #include "clangformatsettings.h"
 #include "clangformattr.h"
 #include "clangformatutils.h"
 
+#include <cppeditor/cppcodestylepreferencesfactory.h>
+#include <cppeditor/cppeditorconstants.h>
+
 #include <projectexplorer/project.h>
 #include <projectexplorer/projecttree.h>
+
 #include <texteditor/icodestylepreferences.h>
+#include <texteditor/texteditorsettings.h>
 
 #include <utils/layoutbuilder.h>
 
@@ -20,7 +27,9 @@
 #include <QSpinBox>
 #include <QWidget>
 
+using namespace CppEditor;
 using namespace ProjectExplorer;
+using namespace TextEditor;
 using namespace Utils;
 
 namespace ClangFormat {
@@ -299,4 +308,38 @@ void ClangFormatGlobalConfigWidget::finish()
         !ClangFormatSettings::instance().useCustomSettings());
 }
 
+class ClangFormatStyleFactory final : public CppCodeStylePreferencesFactory
+{
+public:
+    Indenter *createIndenter(QTextDocument *doc) const final
+    {
+        return new ClangFormatForwardingIndenter(doc);
+    }
+
+    std::pair<TextEditor::CodeStyleEditorWidget *, QString> additionalTab(
+        ICodeStylePreferences *codeStyle, Project *project, QWidget *parent) const final
+    {
+        return {createClangFormatConfigWidget(codeStyle, project, parent), Tr::tr("ClangFormat")};
+    }
+
+    CodeStyleEditorWidget *createAdditionalGlobalSettings(
+        ICodeStylePreferences *codeStyle, Project *project, QWidget *parent) final
+    {
+        return new ClangFormatGlobalConfigWidget(codeStyle, project, parent);
+    }
+};
+
+void setupClangFormatStyleFactory(QObject *guard)
+{
+    static ClangFormatStyleFactory theClangFormatStyleFactory;
+
+    // Replace the default one.
+    TextEditorSettings::unregisterCodeStyleFactory(CppEditor::Constants::CPP_SETTINGS_ID);
+    TextEditorSettings::registerCodeStyleFactory(&theClangFormatStyleFactory);
+
+    QObject::connect(guard, &QObject::destroyed, [] {
+        TextEditorSettings::unregisterCodeStyleFactory(CppEditor::Constants::CPP_SETTINGS_ID);
+    });
+}
+
 } // namespace ClangFormat
diff --git a/src/plugins/clangformat/clangformatglobalconfigwidget.h b/src/plugins/clangformat/clangformatglobalconfigwidget.h
index e4ba4653349..d262f27f950 100644
--- a/src/plugins/clangformat/clangformatglobalconfigwidget.h
+++ b/src/plugins/clangformat/clangformatglobalconfigwidget.h
@@ -61,4 +61,6 @@ private:
     QLabel *m_currentProjectLabel;
 };
 
+void setupClangFormatStyleFactory(QObject *guard);
+
 } // namespace ClangFormat
diff --git a/src/plugins/clangformat/clangformatplugin.cpp b/src/plugins/clangformat/clangformatplugin.cpp
index 7d43a1e23a9..56f50207939 100644
--- a/src/plugins/clangformat/clangformatplugin.cpp
+++ b/src/plugins/clangformat/clangformatplugin.cpp
@@ -1,61 +1,27 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#include "clangformatconfigwidget.h"
 #include "clangformatconstants.h"
 #include "clangformatglobalconfigwidget.h"
-#include "clangformatindenter.h"
 #include "clangformattr.h"
-#include "clangformatutils.h"
 #include "tests/clangformat-test.h"
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
-#include <coreplugin/actionmanager/command.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditor.h>
 #include <coreplugin/idocument.h>
 
-#include <cppeditor/cppcodestylepreferencesfactory.h>
 #include <cppeditor/cppeditorconstants.h>
 
 #include <extensionsystem/iplugin.h>
 
-#include <projectexplorer/project.h>
-
-#include <texteditor/icodestylepreferences.h>
-#include <texteditor/texteditorsettings.h>
-
-#include <QAction>
-
 using namespace Core;
-using namespace CppEditor;
-using namespace ProjectExplorer;
-using namespace TextEditor;
 using namespace Utils;
 
 namespace ClangFormat {
 
-class ClangFormatStyleFactory final : public CppCodeStylePreferencesFactory
-{
-public:
-    Indenter *createIndenter(QTextDocument *doc) const override
-    {
-        return new ClangFormatForwardingIndenter(doc);
-    }
-
-    std::pair<TextEditor::CodeStyleEditorWidget *, QString> additionalTab(
-        ICodeStylePreferences *codeStyle, Project *project, QWidget *parent) const override
-    {
-        return {createClangFormatConfigWidget(codeStyle, project, parent), Tr::tr("ClangFormat")};
-    }
-
-    CodeStyleEditorWidget *createAdditionalGlobalSettings(
-        ICodeStylePreferences *codeStyle, Project *project, QWidget *parent) override
-    {
-        return new ClangFormatGlobalConfigWidget(codeStyle, project, parent);
-    }
-};
+FilePath configForFile(const FilePath &fileName);
 
 class ClangFormatPlugin final : public ExtensionSystem::IPlugin
 {
@@ -64,15 +30,11 @@ class ClangFormatPlugin final : public ExtensionSystem::IPlugin
 
     ~ClangFormatPlugin() final
     {
-        TextEditorSettings::unregisterCodeStyleFactory(CppEditor::Constants::CPP_SETTINGS_ID);
-        delete m_factory;
     }
 
     void initialize() final
     {
-        TextEditorSettings::unregisterCodeStyleFactory(CppEditor::Constants::CPP_SETTINGS_ID);
-        m_factory = new ClangFormatStyleFactory;
-        TextEditorSettings::registerCodeStyleFactory(m_factory);
+        setupClangFormatStyleFactory(this); // This overrides the default, see implementation.
 
         ActionContainer *contextMenu = ActionManager::actionContainer(CppEditor::Constants::M_CONTEXT);
         if (contextMenu) {
@@ -94,8 +56,6 @@ class ClangFormatPlugin final : public ExtensionSystem::IPlugin
         addTestCreator(Internal::createClangFormatTest);
 #endif
     }
-
-    TextEditor::ICodeStylePreferencesFactory *m_factory = nullptr;
 };
 
 } // ClangFormat