diff --git a/src/plugins/qmldesigner/components/componentcore/modelnodeoperations.cpp b/src/plugins/qmldesigner/components/componentcore/modelnodeoperations.cpp
index 711b84c3798..5dd2b1dd5d6 100644
--- a/src/plugins/qmldesigner/components/componentcore/modelnodeoperations.cpp
+++ b/src/plugins/qmldesigner/components/componentcore/modelnodeoperations.cpp
@@ -1525,8 +1525,11 @@ void mergeWithTemplate(const SelectionContext &selectionContext, ExternalDepende
 
     const QString templateFile = getTemplateDialog(projectPath);
 
-    if (QFileInfo::exists(templateFile))
-        StylesheetMerger::styleMerge(selectionContext.view()->model(), templateFile, externalDependencies);
+    if (QFileInfo::exists(templateFile)) {
+        StylesheetMerger::styleMerge(Utils::FilePath::fromString(templateFile),
+                                     selectionContext.view()->model(),
+                                     externalDependencies);
+    }
 }
 
 void removeGroup(const SelectionContext &selectionContext)
diff --git a/src/plugins/qmldesigner/designercore/include/stylesheetmerger.h b/src/plugins/qmldesigner/designercore/include/stylesheetmerger.h
index f4e09cf6f5b..036cb9df659 100644
--- a/src/plugins/qmldesigner/designercore/include/stylesheetmerger.h
+++ b/src/plugins/qmldesigner/designercore/include/stylesheetmerger.h
@@ -5,6 +5,8 @@
 
 #include "qmldesignercorelib_global.h"
 
+#include "utils/filepath.h"
+
 #include <QString>
 #include <QHash>
 #include <modelnode.h>
@@ -26,7 +28,12 @@ class QMLDESIGNERCORE_EXPORT StylesheetMerger
 public:
     StylesheetMerger(AbstractView*, AbstractView*);
     void merge();
-    static void styleMerge(Model *model, const QString &templateFile, class ExternalDependenciesInterface &externalDependencies);
+    static void styleMerge(const Utils::FilePath &templateFile,
+                           Model *model,
+                           class ExternalDependenciesInterface &ed);
+    static void styleMerge(const QString &qmlTemplateString,
+                           Model *model,
+                           class ExternalDependenciesInterface &externalDependencies);
 
 private:
     void preprocessStyleSheet();
diff --git a/src/plugins/qmldesigner/designercore/model/stylesheetmerger.cpp b/src/plugins/qmldesigner/designercore/model/stylesheetmerger.cpp
index dd377cc0180..6df3e58a1d1 100644
--- a/src/plugins/qmldesigner/designercore/model/stylesheetmerger.cpp
+++ b/src/plugins/qmldesigner/designercore/model/stylesheetmerger.cpp
@@ -515,11 +515,24 @@ void StylesheetMerger::merge()
     }
 }
 
-void StylesheetMerger::styleMerge(Model *model, const QString &templateFile, ExternalDependenciesInterface &externalDependencies)
+void StylesheetMerger::styleMerge(const Utils::FilePath &templateFile,
+                                  Model *model,
+                                  ExternalDependenciesInterface &externalDependencies)
+{
+    Utils::FileReader reader;
+
+    QTC_ASSERT(reader.fetch(templateFile), return );
+    const QString qmlTemplateString = QString::fromUtf8(reader.data());
+    StylesheetMerger::styleMerge(qmlTemplateString, model, externalDependencies);
+}
+
+void StylesheetMerger::styleMerge(const QString &qmlTemplateString,
+                                  Model *model,
+                                  ExternalDependenciesInterface &externalDependencies)
 {
     Model *parentModel = model;
 
-    QTC_ASSERT(parentModel, return);
+    QTC_ASSERT(parentModel, return );
 
     auto templateModel(Model::create("QtQuick.Item", 2, 1, parentModel));
     Q_ASSERT(templateModel.get());
@@ -527,10 +540,6 @@ void StylesheetMerger::styleMerge(Model *model, const QString &templateFile, Ext
     templateModel->setFileUrl(parentModel->fileUrl());
 
     QPlainTextEdit textEditTemplate;
-    Utils::FileReader reader;
-
-    QTC_ASSERT(reader.fetch(Utils::FilePath::fromString(templateFile)), return);
-    QString qmlTemplateString = QString::fromUtf8(reader.data());
     QString imports;
 
     for (const Import &import : parentModel->imports()) {
@@ -541,13 +550,14 @@ void StylesheetMerger::styleMerge(Model *model, const QString &templateFile, Ext
     textEditTemplate.setPlainText(imports + qmlTemplateString);
     NotIndentingTextEditModifier textModifierTemplate(&textEditTemplate);
 
-    QScopedPointer<RewriterView> templateRewriterView(new RewriterView(externalDependencies, RewriterView::Amend));
+    QScopedPointer<RewriterView> templateRewriterView(
+        new RewriterView(externalDependencies, RewriterView::Amend));
     templateRewriterView->setTextModifier(&textModifierTemplate);
     templateModel->attachView(templateRewriterView.data());
     templateRewriterView->setCheckSemanticErrors(false);
 
     ModelNode templateRootNode = templateRewriterView->rootModelNode();
-    QTC_ASSERT(templateRootNode.isValid(), return);
+    QTC_ASSERT(templateRootNode.isValid(), return );
 
     auto styleModel(Model::create("QtQuick.Item", 2, 1, parentModel));
     Q_ASSERT(styleModel.get());
@@ -556,11 +566,12 @@ void StylesheetMerger::styleMerge(Model *model, const QString &templateFile, Ext
 
     QPlainTextEdit textEditStyle;
     RewriterView *parentRewriterView = parentModel->rewriterView();
-    QTC_ASSERT(parentRewriterView, return);
+    QTC_ASSERT(parentRewriterView, return );
     textEditStyle.setPlainText(parentRewriterView->textModifierContent());
     NotIndentingTextEditModifier textModifierStyle(&textEditStyle);
 
-    QScopedPointer<RewriterView> styleRewriterView(new RewriterView(externalDependencies, RewriterView::Amend));
+    QScopedPointer<RewriterView> styleRewriterView(
+        new RewriterView(externalDependencies, RewriterView::Amend));
     styleRewriterView->setTextModifier(&textModifierStyle);
     styleModel->attachView(styleRewriterView.data());