Fix QDir::entryList to work for directories that end with '.lnk'

In addition to checking the .lnk extension, check that the
the specified path is not a path to a directory.

Pick-to: 6.2
Fixes: QTBUG-85058
Change-Id: I83cef3d94c6ffa82a88f374c5b41779e88fe40b8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/corelib/io/qfilesystemengine_p.h

@@ -144,6 +144,7 @@ public:
                             QAbstractFileEngine::FileTime whatTime, QSystemError &error);
     static QString owner(const QFileSystemEntry &entry, QAbstractFileEngine::FileOwner own);
     static QString nativeAbsoluteFilePath(const QString &path);
+    static bool isDirPath(const QString &path, bool *existed);
 #endif
     //homePath, rootPath and tempPath shall return clean paths
     static QString homePath();

src/corelib/io/qfilesystemengine_win.cpp

@@ -1022,8 +1022,6 @@ bool QFileSystemEngine::fillMetaData(HANDLE fHandle, QFileSystemMetaData &data,
     return data.hasFlags(what);
 }
 
-static bool isDirPath(const QString &dirPath, bool *existed);
-
 //static
 bool QFileSystemEngine::fillMetaData(const QFileSystemEntry &entry, QFileSystemMetaData &data,
                                      QFileSystemMetaData::MetaDataFlags what)
@@ -1103,7 +1101,8 @@ static inline bool rmDir(const QString &path)
     return ::RemoveDirectory((wchar_t*)QFSFileEnginePrivate::longFileName(path).utf16());
 }
 
-static bool isDirPath(const QString &dirPath, bool *existed)
+//static
+bool QFileSystemEngine::isDirPath(const QString &dirPath, bool *existed)
 {
     QString path = dirPath;
     if (path.length() == 2 && path.at(1) == QLatin1Char(':'))
@@ -1141,7 +1140,7 @@ static bool createDirectoryWithParents(const QString &nativeName, bool shouldMkd
     };
     const auto isDir = [](const QString &nativeName) {
         bool exists = false;
-        return isDirPath(nativeName, &exists) && exists;
+        return QFileSystemEngine::isDirPath(nativeName, &exists) && exists;
     };
     // Do not try to mkdir a UNC root path or a drive letter.
     if (isUNCRoot(nativeName) || isDriveName(nativeName))

src/corelib/io/qfilesystemiterator_win.cpp

@@ -59,7 +59,7 @@ QFileSystemIterator::QFileSystemIterator(const QFileSystemEntry &entry, QDir::Fi
 {
     Q_UNUSED(nameFilters);
     Q_UNUSED(flags);
-    if (nativePath.endsWith(QLatin1String(".lnk"))) {
+    if (nativePath.endsWith(u".lnk"_qs) && !QFileSystemEngine::isDirPath(dirPath, nullptr)) {
         QFileSystemMetaData metaData;
         QFileSystemEntry link = QFileSystemEngine::getLinkTarget(entry, metaData);
         nativePath = link.nativeFilePath();

tests/auto/corelib/io/qdir/tst_qdir.cpp

@@ -722,13 +722,16 @@ void tst_QDir::entryList_data()
               << QString("qdir.pro,qrc_qdir.cpp,tst_qdir.cpp").split(',');
     QTest::newRow("testdir1")  << (m_dataPath + "/testdir") << QStringList()
               << (int)(QDir::AllDirs) << (int)(QDir::NoSort)
-              << QString(".,..,dir,spaces").split(',');
+              << QString(".,..,dir,dir.lnk,spaces").split(',');
     QTest::newRow("resources1") << QString(":/tst_qdir/resources/entryList") << QStringList("*.data")
                              << (int)(QDir::NoFilter) << (int)(QDir::NoSort)
                              << QString("file1.data,file2.data,file3.data").split(',');
     QTest::newRow("resources2") << QString(":/tst_qdir/resources/entryList") << QStringList("*.data")
                              << (int)(QDir::Files) << (int)(QDir::NoSort)
                              << QString("file1.data,file2.data,file3.data").split(',');
+    QTest::newRow("testdir.lnk") << (m_dataPath + "/testdir/dir.lnk") << QStringList()
+                             << (int)(QDir::NoFilter) << (int)(QDir::NoSort)
+                             << QString(".,..,aaaaa.txt,subdir,subdir.lnk").split(',');
 }
 
 void tst_QDir::entryList()
@@ -1685,9 +1688,9 @@ void tst_QDir::dotAndDotDot()
 {
     QDir dir(QString((m_dataPath + "/testdir/")));
     QStringList entryList = dir.entryList(QDir::Dirs);
-    QCOMPARE(entryList, QStringList() << QString(".") << QString("..") << QString("dir") << QString("spaces"));
+    QCOMPARE(entryList, QStringList({ u"."_qs, u".."_qs, u"dir"_qs, u"dir.lnk"_qs, u"spaces"_qs }));
     entryList = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
-    QCOMPARE(entryList, QStringList() << QString("dir") << QString("spaces"));
+    QCOMPARE(entryList, QStringList({ u"dir"_qs, u"dir.lnk"_qs, u"spaces"_qs }));
 }
 
 void tst_QDir::homePath()