PersistentSettingsWriter: Ensure that the directory exists

Task-number: QTCREATORBUG-7600

Change-Id: I5dc5ab24baff8fa14acd4d58dcb554e8531a150c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/libs/utils/persistentsettings.cpp

@@ -38,6 +38,7 @@
 
 #include <QDebug>
 #include <QFile>
+#include <QDir>
 #include <QVariant>
 #include <QStack>
 #include <QXmlStreamAttributes>
@@ -385,6 +386,8 @@ void PersistentSettingsWriter::saveValue(const QString &variable, const QVariant
 bool PersistentSettingsWriter::save(const QString &fileName, const QString &docType,
                                     QWidget *parent) const
 {
+    QDir tmp;
+    tmp.mkpath(QFileInfo(fileName).path());
     Utils::FileSaver saver(fileName, QIODevice::Text);
     if (!saver.hasError()) {
         const Context ctx;