diff --git a/src/file/fileindexerconfig.cpp b/src/file/fileindexerconfig.cpp
index bd186ee8..ad252b10 100644
--- a/src/file/fileindexerconfig.cpp
+++ b/src/file/fileindexerconfig.cpp
@@ -1,399 +1,409 @@
 /* This file is part of the KDE Project
    Copyright (c) 2008-2010 Sebastian Trueg <trueg@kde.org>
    Copyright (c) 2013-2014 Vishesh Handa <me@vhanda.in>
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2 as published by the Free Software Foundation.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 
 #include "fileindexerconfig.h"
 #include "fileexcludefilters.h"
 #include "storagedevices.h"
 
 #include <QStringList>
 #include <QDir>
 
 #include <QStandardPaths>
 #include <KConfigGroup>
 
 
 namespace
 {
 /// recursively check if a folder is hidden
 bool isDirHidden(const QDir& dir)
 {
 #ifdef __unix__
     return dir.absolutePath().contains(QLatin1String("/."));
 #else
     QDir d = dir;
     do {
         if (QFileInfo(d.path()).isHidden())
             return true;
     } while (d.cdUp());
 
     return false;
 #endif
 }
 
 QString normalizeTrailingSlashes(QString&& path)
 {
     while (path.endsWith(QLatin1Char('/'))) {
         path.chop(1);
     }
     path += QLatin1Char('/');
     return path;
 }
 
 }
 
 using namespace Baloo;
 
 FileIndexerConfig::FileIndexerConfig(QObject* parent)
     : QObject(parent)
     , m_config(QStringLiteral("baloofilerc"))
     , m_folderCacheDirty(true)
     , m_indexHidden(false)
     , m_devices(nullptr)
     , m_maxUncomittedFiles(40)
 {
     forceConfigUpdate();
 }
 
 
 FileIndexerConfig::~FileIndexerConfig()
 {
 }
 
 
 QStringList FileIndexerConfig::includeFolders() const
 {
     const_cast<FileIndexerConfig*>(this)->buildFolderCache();
 
     QStringList fl;
     for (int i = 0; i < m_folderCache.count(); ++i) {
         if (m_folderCache[i].second)
             fl << m_folderCache[i].first;
     }
     return fl;
 }
 
 
 QStringList FileIndexerConfig::excludeFolders() const
 {
     const_cast<FileIndexerConfig*>(this)->buildFolderCache();
 
     QStringList fl;
     for (int i = 0; i < m_folderCache.count(); ++i) {
         if (!m_folderCache[i].second)
             fl << m_folderCache[i].first;
     }
     return fl;
 }
 
 
 QStringList FileIndexerConfig::excludeFilters() const
 {
     KConfigGroup cfg = m_config.group("General");
 
     // read configured exclude filters
-    QSet<QString> filters = cfg.readEntry("exclude filters", defaultExcludeFilterList()).toSet();
+    QStringList filters = cfg.readEntry("exclude filters", defaultExcludeFilterList());
 
     // make sure we always keep the latest default exclude filters
     // TODO: there is one problem here. What if the user removed some of the default filters?
     if (cfg.readEntry("exclude filters version", 0) < defaultExcludeFilterListVersion()) {
-        filters += defaultExcludeFilterList().toSet();
+        filters += defaultExcludeFilterList();
+        // in case the cfg entry was empty and filters == defaultExcludeFilterList()
+        filters.removeDuplicates();
 
         // write the config directly since the KCM does not have support for the version yet
         // TODO: make this class public and use it in the KCM
         KConfig config(m_config.name());
         KConfigGroup cfg = config.group("General");
-        cfg.writeEntry("exclude filters", QStringList::fromSet(filters));
+        cfg.writeEntry("exclude filters", filters);
         cfg.writeEntry("exclude filters version", defaultExcludeFilterListVersion());
     }
 
-    // remove duplicates
-    return QStringList::fromSet(filters);
+    return filters;
 }
 
 QStringList FileIndexerConfig::excludeMimetypes() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     return QStringList::fromSet(m_excludeMimetypes);
+#else
+    return QList<QString>(m_excludeMimetypes.begin(), m_excludeMimetypes.end());
+#endif
 }
 
 bool FileIndexerConfig::indexHiddenFilesAndFolders() const
 {
     return m_indexHidden;
 }
 
 bool FileIndexerConfig::onlyBasicIndexing() const
 {
     return m_onlyBasicIndexing;
 }
 
 bool FileIndexerConfig::isInitialRun() const
 {
     return m_config.group("General").readEntry("first run", true);
 }
 
 
 bool FileIndexerConfig::canBeSearched(const QString& folder) const
 {
     QFileInfo fi(folder);
     QString path = fi.absolutePath();
     if (!fi.isDir()) {
         return false;
     } else if (shouldFolderBeIndexed(path)) {
         return true;
     }
 
     const_cast<FileIndexerConfig*>(this)->buildFolderCache();
     
     // Look for included descendants
     for (const QPair<QString, bool>& fld: qAsConst(m_folderCache)) {
         if (fld.second && fld.first.startsWith(path)) {
             return true;
         }
     }
 
     return false;
 }
 
 bool FileIndexerConfig::shouldBeIndexed(const QString& path) const
 {
     QFileInfo fi(path);
     if (fi.isDir()) {
         return shouldFolderBeIndexed(path);
     } else {
         return (shouldFolderBeIndexed(fi.absolutePath()) &&
                 (!fi.isHidden() || indexHiddenFilesAndFolders()) &&
                 shouldFileBeIndexed(fi.fileName()));
     }
 }
 
 
 bool FileIndexerConfig::shouldFolderBeIndexed(const QString& path) const
 {
     QString folder;
     if (folderInFolderList(path, folder)) {
         // we always index the folders in the list
         // ignoring the name filters
         if (folder == normalizeTrailingSlashes(QString(path)))
             return true;
 
         // check for hidden folders
         QDir dir(path);
         if (!indexHiddenFilesAndFolders() && isDirHidden(dir))
             return false;
 
         // check the exclude filters for all components of the path
         // after folder
         const QStringList pathComponents = path.mid(folder.count()).split(QLatin1Char('/'), QString::SkipEmptyParts);
         for (const QString& c : pathComponents) {
             if (!shouldFileBeIndexed(c)) {
                 return false;
             }
         }
         return true;
     } else {
         return false;
     }
 }
 
 
 bool FileIndexerConfig::shouldFileBeIndexed(const QString& fileName) const
 {
     if (!indexHiddenFilesAndFolders() && fileName.startsWith(QLatin1Char('.'))) {
         return false;
     }
     return !m_excludeFilterRegExpCache.exactMatch(fileName);
 }
 
 bool FileIndexerConfig::shouldMimeTypeBeIndexed(const QString& mimeType) const
 {
     return !m_excludeMimetypes.contains(mimeType);
 }
 
 
 bool FileIndexerConfig::folderInFolderList(const QString& path)
 {
     QString str;
     return folderInFolderList(path, str);
 }
 
 bool FileIndexerConfig::folderInFolderList(const QString& path, QString& folder) const
 {
     const_cast<FileIndexerConfig*>(this)->buildFolderCache();
 
     const QString p = normalizeTrailingSlashes(QString(path));
 
     // we traverse the list backwards to catch all exclude folders
     int i = m_folderCache.count();
     while (--i >= 0) {
         const QString& f = m_folderCache[i].first;
         const bool include = m_folderCache[i].second;
         if (p.startsWith(f)) {
             folder = f;
             return include;
         }
     }
     // path is not in the list, thus it should not be included
     folder.clear();
     return false;
 }
 
 
 namespace
 {
 /**
  * Returns true if the specified folder f would already be excluded using the list
  * folders.
  */
 bool alreadyExcluded(const QList<QPair<QString, bool> >& folders, const QString& f)
 {
     bool included = false;
     for (int i = 0; i < folders.count(); ++i) {
         QString path = folders[i].first;
 
         if (f != folders[i].first && f.startsWith(path)) {
             included = folders[i].second;
         }
     }
     return !included;
 }
 
 /**
  * Simple insertion sort
  */
 void insertSortFolders(const QStringList& folders, bool include, QList<QPair<QString, bool> >& result)
 {
     for (QString path : folders) {
         int pos = 0;
         path = normalizeTrailingSlashes(std::move(path));
         while (result.count() > pos &&
                 result[pos].first < path)
             ++pos;
         result.insert(pos, qMakePair(path, include));
     }
 }
 
 /**
  * Remove useless exclude entries which would confuse the folderInFolderList algo.
  * This makes sure all top-level items are include folders.
  * This runs in O(n^2) and could be optimized but what for.
  */
 void cleanupList(QList<QPair<QString, bool> >& result)
 {
     int i = 0;
     while (i < result.count()) {
         if (result[i].first.isEmpty() ||
                 (!result[i].second &&
                  alreadyExcluded(result, result[i].first)))
             result.removeAt(i);
         else
             ++i;
     }
 }
 }
 
 void FileIndexerConfig::buildFolderCache()
 {
     if (!m_folderCacheDirty) {
         return;
     }
 
     if (!m_devices) {
         m_devices = new StorageDevices(this);
     }
 
     KConfigGroup group = m_config.group("General");
     QStringList includeFoldersPlain = group.readPathEntry("folders", QStringList() << QDir::homePath());
     QStringList excludeFoldersPlain = group.readPathEntry("exclude folders", QStringList());
 
     // Add all removable media and network shares as ignored unless they have
     // been explicitly added in the include list
     const auto allMedia = m_devices->allMedia();
     for (const auto& device: allMedia) {
         const QString mountPath = device.mountPath();
         if (!device.isUsable() && !mountPath.isEmpty()) {
             if (!includeFoldersPlain.contains(mountPath)) {
                 excludeFoldersPlain << mountPath;
             }
         }
     }
 
     m_folderCache.clear();
     insertSortFolders(includeFoldersPlain, true, m_folderCache);
     insertSortFolders(excludeFoldersPlain, false, m_folderCache);
 
     cleanupList(m_folderCache);
 
     m_folderCacheDirty = false;
 }
 
 
 void FileIndexerConfig::buildExcludeFilterRegExpCache()
 {
     QStringList newFilters = excludeFilters();
     m_excludeFilterRegExpCache.rebuildCacheFromFilterList(newFilters);
 }
 
 void FileIndexerConfig::buildMimeTypeCache()
 {
-    m_excludeMimetypes = m_config.group("General").readPathEntry("exclude mimetypes", defaultExcludeMimetypes()).toSet();
+    const QStringList excludedTypes = m_config.group("General").readPathEntry("exclude mimetypes", defaultExcludeMimetypes());
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    m_excludeMimetypes = excludedTypes.toSet();
+#else
+    m_excludeMimetypes = QSet<QString>(excludedTypes.begin(), excludedTypes.end());
+#endif
 }
 
 void FileIndexerConfig::forceConfigUpdate()
 {
     m_config.reparseConfiguration();
 
     m_folderCacheDirty = true;
     buildExcludeFilterRegExpCache();
     buildMimeTypeCache();
 
     m_indexHidden = m_config.group("General").readEntry("index hidden folders", false);
     m_onlyBasicIndexing = m_config.group("General").readEntry("only basic indexing", false);
 }
 
 void FileIndexerConfig::setInitialRun(bool isInitialRun)
 {
     m_config.group("General").writeEntry("first run", isInitialRun);
     m_config.sync();
 }
 
 bool FileIndexerConfig::initialUpdateDisabled() const
 {
     return m_config.group("General").readEntry("disable initial update", true);
 }
 
 int FileIndexerConfig::databaseVersion() const
 {
     return m_config.group("General").readEntry("dbVersion", 0);
 }
 
 void FileIndexerConfig::setDatabaseVersion(int version)
 {
     m_config.group("General").writeEntry("dbVersion", version);
     m_config.sync();
 }
 
 bool FileIndexerConfig::indexingEnabled() const
 {
     return m_config.group("Basic Settings").readEntry("Indexing-Enabled", true);
 }
 
 uint FileIndexerConfig::maxUncomittedFiles() const
 {
     return m_maxUncomittedFiles;
 }
 
diff --git a/src/lib/filemonitor.cpp b/src/lib/filemonitor.cpp
index ed48bf1c..80f463c5 100644
--- a/src/lib/filemonitor.cpp
+++ b/src/lib/filemonitor.cpp
@@ -1,87 +1,95 @@
 /*
  * <one line to give the library's name and an idea of what it does.>
  * Copyright (C) 2013  Vishesh Handa <me@vhanda.in>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */
 
 #include "filemonitor.h"
 
 #include <QSet>
 #include <QString>
 #include <QStringList>
 #include <QDBusConnection>
 
 using namespace Baloo;
 
 class FileMonitor::Private {
 public:
     QSet<QString> m_files;
 };
 
 FileMonitor::FileMonitor(QObject* parent)
     : QObject(parent)
     , d(new Private)
 {
     QDBusConnection con = QDBusConnection::sessionBus();
     con.connect(QString(), QStringLiteral("/files"), QStringLiteral("org.kde"),
                 QStringLiteral("changed"), this, SLOT(slotFileMetaDataChanged(QStringList)));
 }
 
 FileMonitor::~FileMonitor()
 {
     delete d;
 }
 
 void FileMonitor::addFile(const QString& fileUrl)
 {
     QString f = fileUrl;
     if (f.endsWith(QLatin1Char('/')))
         f = f.mid(0, f.length()-1);
 
     d->m_files.insert(f);
 }
 
 void FileMonitor::addFile(const QUrl& url)
 {
     const QString localFile = url.toLocalFile();
     if (!localFile.isEmpty())
         addFile(localFile);
 }
 
 void FileMonitor::setFiles(const QStringList& fileList)
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     d->m_files = fileList.toSet();
+#else
+    d->m_files = QSet<QString>(fileList.begin(), fileList.end());
+#endif
 }
 
 QStringList FileMonitor::files() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     return QStringList(d->m_files.toList());
+#else
+    return QList<QString>(d->m_files.begin(), d->m_files.end());
+#endif
 }
 
 void FileMonitor::clear()
 {
     d->m_files.clear();
 }
 
 void FileMonitor::slotFileMetaDataChanged(const QStringList& fileUrls)
 {
     for (const QString& url : fileUrls) {
         if (d->m_files.contains(url)) {
             Q_EMIT fileMetaDataChanged(url);
         }
     }
 }