Fixed a problem with adding files when final newline is missing

When there was no final newline in the .files file, the name of the
first new file would get appended to the name of the last file. This
patch fixes that by simply rewriting the whole file.

Also switched to writing out native line endings.

src/plugins/genericprojectmanager/genericproject.cpp

@@ -170,18 +170,22 @@ static QStringList readLines(const QString &absoluteFileName)
 
 bool GenericProject::addFiles(const QStringList &filePaths)
 {
+    // Make sure we can open the file for writing
     QFile file(filesFileName());
-    if (file.open(QFile::Append)) {
-        QTextStream stream(&file);
-        QDir baseDir(QFileInfo(m_fileName).dir());
-        foreach (const QString &filePath, filePaths) {
-            stream << baseDir.relativeFilePath(filePath) << "\n";
-        }
-        file.close();
-        refresh(GenericProject::Files);
-        return true;
-    }
-    return false;
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
+        return false;
+
+    QStringList newFileList = m_files;
+    newFileList.append(filePaths);
+
+    QTextStream stream(&file);
+    QDir baseDir(QFileInfo(m_fileName).dir());
+    foreach (const QString &filePath, newFileList)
+        stream << baseDir.relativeFilePath(filePath) << QLatin1Char('\n');
+
+    file.close();
+    refresh(GenericProject::Files);
+    return true;
 }
 
 void GenericProject::parseProject(RefreshOptions options)