Utils: filepathify TextFileFormat

Change-Id: I6a4e2d38b0bbdec661a4a492901d9182a9f2e502
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/git/gitclient.cpp

@@ -3836,8 +3836,11 @@ IEditor *GitClient::openShowEditor(const QString &workingDirectory, const QStrin
         if (content.isEmpty())
             return nullptr;
         QByteArray fileContent;
-        if (TextFileFormat::readFileUTF8(path, nullptr, &fileContent, nullptr)
-                == TextFileFormat::ReadSuccess) {
+        if (TextFileFormat::readFileUTF8(Utils::FilePath::fromString(path),
+                                         nullptr,
+                                         &fileContent,
+                                         nullptr)
+            == TextFileFormat::ReadSuccess) {
             if (fileContent == content)
                 return nullptr; // open the file for read/write
         }