qmlformat: do not generate backup files

qmlformat used to backup the original input file up to 2 copies when used
with --inplace mode. Change this hardcoded number into 0 and generate no
backup file.

Fixes: QTBUG-107685
Change-Id: Ifca86968fa65be0fd678012fc2e41b9ed8601d21
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

tests/auto/qml/qmlformat/tst_qmlformat.cpp

@@ -38,6 +38,8 @@ private Q_SLOTS:
     void normalizeExample_data();
 #endif
 
+    void testBackupFileLimit();
+
 private:
     QString readTestFile(const QString &path);
     QString runQmlformat(const QString &fileToFormat, QStringList args, bool shouldSucceed = true,
@@ -366,6 +368,29 @@ void TestQmlformat::normalizeExample()
 }
 #endif
 
+void TestQmlformat::testBackupFileLimit()
+{
+    // Create a temporary directory
+    QTemporaryDir tempDir;
+
+    // Unformatted file to format
+    const QString fileToFormat{ testFile("Annotations.qml") };
+
+    {
+        const QString tempFile = tempDir.path() + QDir::separator() + "test_0.qml";
+        const QString backupFile = tempFile + QStringLiteral("~");
+        QFile::copy(fileToFormat, tempFile);
+
+        QProcess process;
+        process.start(m_qmlformatPath, QStringList{ "--verbose", "--inplace", tempFile });
+        QVERIFY(process.waitForFinished());
+        QCOMPARE(process.exitStatus(), QProcess::NormalExit);
+        QCOMPARE(process.exitCode(), 0);
+        QVERIFY(QFileInfo::exists(tempFile));
+        QVERIFY(!QFileInfo::exists(backupFile));
+    };
+}
+
 QString TestQmlformat::runQmlformat(const QString &fileToFormat, QStringList args,
                                     bool shouldSucceed, RunOption rOptions)
 {

tools/qmlformat/qmlformat.cpp

@@ -123,7 +123,8 @@ bool parseFile(const QString &filename, const Options &options)
         if (options.verbose)
             qWarning().noquote() << "Writing to file" << filename;
         FileWriter fw;
-        res = qmlFile.writeOut(filename, 2, lwOptions, &fw, checks);
+        const unsigned numberOfBackupFiles = 0;
+        res = qmlFile.writeOut(filename, numberOfBackupFiles, lwOptions, &fw, checks);
     } else {
         QFile out;
         out.open(stdout, QIODevice::WriteOnly);