Fix project storage folder incorrectly stored, resulting on modified project on open

src/doc/kdenlivedoc.cpp

@@ -1308,8 +1308,8 @@ QMap<QString, QString> KdenliveDoc::documentProperties()
     m_documentProperties.insert(QStringLiteral("version"), QString::number(DOCUMENTVERSION));
     m_documentProperties.insert(QStringLiteral("kdenliveversion"), QStringLiteral(KDENLIVE_VERSION));
     if (!m_projectFolder.isEmpty()) {
-        m_documentProperties.insert(QStringLiteral("storagefolder"),
-                                    m_projectFolder + QLatin1Char('/') + m_documentProperties.value(QStringLiteral("documentid")));
+        QDir folder(m_projectFolder);
+        m_documentProperties.insert(QStringLiteral("storagefolder"), folder.absoluteFilePath(m_documentProperties.value(QStringLiteral("documentid"))));
     }
     m_documentProperties.insert(QStringLiteral("profile"), pCore->getCurrentProfile()->path());
     if (m_documentProperties.contains(QStringLiteral("decimalPoint"))) {

src/project/projectmanager.cpp

@@ -174,10 +174,11 @@ void ProjectManager::newFile(QString profileName, bool showProjectSettings)
         }
         if (KdenliveSettings::customprojectfolder()) {
             projectFolder = KdenliveSettings::defaultprojectfolder();
+            QDir folder(projectFolder);
             if (!projectFolder.endsWith(QLatin1Char('/'))) {
                 projectFolder.append(QLatin1Char('/'));
             }
-            documentProperties.insert(QStringLiteral("storagefolder"), projectFolder + documentId);
+            documentProperties.insert(QStringLiteral("storagefolder"), folder.absoluteFilePath(documentId));
         }
     } else {
         QPointer<ProjectSettings> w = new ProjectSettings(nullptr, QMap<QString, QString>(), QStringList(), projectTracks.first, projectTracks.second, audioChannels, KdenliveSettings::defaultprojectfolder(), false, true, pCore->window());