Allow event processing between each XML parser run, to improve GUI performance.

src/gui/editlocallyjob.cpp

@@ -206,7 +206,7 @@ void EditLocallyJob::fetchRemoteFileParentInfo()
         return;
     }
 
-    const auto job = new LsColJob(_accountState->account(), QDir::cleanPath(_folderForFile->remotePathTrailingSlash() + _relPathParent), this);
+    const auto job = new LsColJob(_accountState->account(), QDir::cleanPath(_folderForFile->remotePathTrailingSlash() + _relPathParent));
     const QList<QByteArray> props{QByteArrayLiteral("resourcetype"),
                                   QByteArrayLiteral("getlastmodified"),
                                   QByteArrayLiteral("getetag"),

src/gui/folderstatusmodel.cpp

@@ -614,7 +614,7 @@ void FolderStatusModel::fetchMore(const QModelIndex &parent)
         path += infoPath;
     }
 
-    auto *job = new LsColJob(_accountState->account(), path, this);
+    auto *job = new LsColJob(_accountState->account(), path);
     info->_fetchingJob = job;
     auto props = QList<QByteArray>() << "resourcetype"
                                      << "http://owncloud.org/ns:size"

src/gui/folderwizard.cpp

@@ -464,7 +464,7 @@ void FolderWizardRemotePath::slotTypedPathFound(const QStringList &subpaths)
 
 LsColJob *FolderWizardRemotePath::runLsColJob(const QString &path)
 {
-    auto *job = new LsColJob(_account, path, this);
+    auto *job = new LsColJob(_account, path);
     auto props = QList<QByteArray>() << "resourcetype";
     if (_account->capabilities().clientSideEncryptionAvailable()) {
         props << "http://nextcloud.org/ns:is-encrypted";

src/gui/selectivesyncdialog.cpp

@@ -107,7 +107,7 @@
 {
     _encryptedPaths.clear();
 
-    auto *job = new LsColJob(_account, _folderPath, this);
+    auto *job = new LsColJob(_account, _folderPath);
     auto props = QList<QByteArray>() << "resourcetype"
                                      << "http://owncloud.org/ns:size";
     if (_account->capabilities().clientSideEncryptionAvailable()) {
@@ -336,7 +336,7 @@
     if (!_folderPath.isEmpty()) {
         prefix = _folderPath + QLatin1Char('/');
     }
-    auto *job = new LsColJob(_account, prefix + dir, this);
+    auto *job = new LsColJob(_account, prefix + dir);
     job->setProperties(QList<QByteArray>() << "resourcetype"
                                            << "http://owncloud.org/ns:size");
     connect(job, &LsColJob::directoryListingSubfolders,

src/gui/shellextensionsserver.cpp

@@ -168,7 +168,7 @@ void ShellExtensionsServer::processCustomStateRequest(QLocalSocket *socket, cons
         closeSession(socket);
     }));
 
-    auto *const lsColJob = new LsColJob(folder->accountState()->account(), QDir::cleanPath(folder->remotePath() + lsColJobPath), this);
+    auto *const lsColJob = new LsColJob(folder->accountState()->account(), QDir::cleanPath(folder->remotePath() + lsColJobPath));
     lsColJob->setProperties({QByteArrayLiteral("http://owncloud.org/ns:share-types"), QByteArrayLiteral("http://owncloud.org/ns:permissions")});
 
     const auto folderAlias = customStateRequestInfo.folderAlias;

src/libsync/discoveryphase.cpp

@@ -378,7 +378,7 @@
 void DiscoverySingleDirectoryJob::start()
 {
     // Start the actual HTTP job
-    auto *lsColJob = new LsColJob(_account, _subPath, this);
+    auto *lsColJob = new LsColJob(_account, _subPath);
 
     QList<QByteArray> props;
     props << "resourcetype"

src/libsync/encryptedfoldermetadatahandler.cpp

@@ -99,7 +99,7 @@ void EncryptedFolderMetadataHandler::startFetchMetadata()
 void EncryptedFolderMetadataHandler::fetchFolderEncryptedId()
 {
     qCDebug(lcFetchAndUploadE2eeFolderMetadataJob) << "Folder is encrypted, let's get the Id from it.";
-    const auto job = new LsColJob(_account, _folderPath, this);
+    const auto job = new LsColJob(_account, _folderPath);
     job->setProperties({"resourcetype", "http://owncloud.org/ns:fileid"});
     connect(job, &LsColJob::directoryListingSubfolders, this, &EncryptedFolderMetadataHandler::slotFolderEncryptedIdReceived);
     connect(job, &LsColJob::finishedWithError, this, &EncryptedFolderMetadataHandler::slotFolderEncryptedIdError);

src/libsync/networkjobs.cpp

@@ -1,4 +1,4 @@
 /*
  * Copyright (C) by Klaas Freitag <[email protected]>
  * Copyright (C) by Daniel Molkentin <[email protected]>
  *
@@ -317,13 +317,13 @@
 
 /*********************************************************************************************/
 
-LsColJob::LsColJob(AccountPtr account, const QString &path, QObject *parent)
-    : AbstractNetworkJob(account, path, parent)
+LsColJob::LsColJob(AccountPtr account, const QString &path)
+    : AbstractNetworkJob(account, path)
 {
 }
 
-LsColJob::LsColJob(AccountPtr account, const QUrl &url, QObject *parent)
-    : AbstractNetworkJob(account, QString(), parent)
+LsColJob::LsColJob(AccountPtr account, const QUrl &url)
+    : AbstractNetworkJob(account, QString())
     , _url(url)
 {
 }
@@ -404,6 +404,13 @@
         connect(&parser, &LsColXMLParser::finishedWithoutError,
             this, &LsColJob::finishedWithoutError);
 
+        // bool LsColXMLParser::parse takes a while, let's process some events in attempt to make UI more responsive
+        // from https://doc.qt.io/qt-5/qcoreapplication.html#processEvents-1 
+        // "You can call this function occasionally when your program is busy doing a long operation (e.g. copying a file)."
+        // we should not abuse this function, as it affects QObject instances lifetime (when children are getting deleted or when deleteLater is called)
+        // one reason I had to remove ability for LsColJob to have parent, which, otherwise, leads to a crash later
+        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
+
         QString expectedPath = reply()->request().url().path(); // something like "/owncloud/remote.php/dav/folder"
         if (!parser.parse(reply()->readAll(), &_folderInfos, expectedPath)) {
             // XML parse error
@@ -414,6 +421,8 @@
         emit finishedWithError(reply());
     }
 
+    this->deleteLater();
+
     return true;
 }
 

src/libsync/networkjobs.h

@@ -140,8 +140,8 @@ class OWNCLOUDSYNC_EXPORT LsColJob : public AbstractNetworkJob
 {
     Q_OBJECT
 public:
-    explicit LsColJob(AccountPtr account, const QString &path, QObject *parent = nullptr);
-    explicit LsColJob(AccountPtr account, const QUrl &url, QObject *parent = nullptr);
+    explicit LsColJob(AccountPtr account, const QString &path);
+    explicit LsColJob(AccountPtr account, const QUrl &url);
     void start() override;
     QHash<QString, ExtraFolderInfo> _folderInfos;
 

src/libsync/propagateuploadng.cpp

@@ -105,7 +105,7 @@ void PropagateUploadFileNG::doStartUpload()
     if (progressInfo._valid && progressInfo.isChunked() && progressInfo._modtime == _item->_modtime && progressInfo._size == _item->_size) {
         _transferId = progressInfo._transferid;
 
-        const auto job = new LsColJob(propagator()->account(), chunkUploadFolderUrl(), this);
+        const auto job = new LsColJob(propagator()->account(), chunkUploadFolderUrl());
         _jobs.append(job);
         job->setProperties(QList<QByteArray>() << "resourcetype"
                                                << "getcontentlength");