diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,8 +33,8 @@
     NotifyConfig
     NewStuff
     Notifications
+    WindowSystem
     XmlGui
-    KDELibs4Support
 )
 include_directories (${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} )
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@
 ########### next target ###############
 
 set(kwordquiz_SRCS
+   filterproxysearchline.cpp
    kwordquizprefs.cpp
    kwordquiz.cpp
    main.cpp
@@ -83,7 +84,7 @@
     KF5::NotifyConfig
     KF5::XmlGui
     KF5::GuiAddons
-    KF5::KDELibs4Support
+    KF5::WindowSystem
     LibKEduVocDocumentImport__KEduVocDocument
     Phonon::phonon4qt5
 )
diff --git a/src/cleardialogbase.ui b/src/cleardialogbase.ui
--- a/src/cleardialogbase.ui
+++ b/src/cleardialogbase.ui
@@ -16,7 +16,7 @@
     <number>0</number>
    </property>
    <item row="0" column="0">
-    <widget class="KButtonGroup" name="clearButtonGroup">
+    <widget class="QGroupBox" name="clearButtonGroup">
      <property name="title">
       <string>Selection</string>
      </property>
@@ -110,14 +110,6 @@
    </item>
   </layout>
  </widget>
- <customwidgets>
-  <customwidget>
-   <class>KButtonGroup</class>
-   <extends>QGroupBox</extends>
-   <header>kbuttongroup.h</header>
-   <container>1</container>
-  </customwidget>
- </customwidgets>
  <resources/>
  <connections/>
 </ui>
diff --git a/src/filterproxysearchline.h b/src/filterproxysearchline.h
new file mode 100644
--- /dev/null
+++ b/src/filterproxysearchline.h
@@ -0,0 +1,49 @@
+/*
+ * This file is part of KDevelop
+ *
+ * Copyright 2018 Friedrich W. H. Kossebau <kossebau@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef KDEPROVIDER_FILTERPROXYSEARCHLINE_H
+#define KDEPROVIDER_FILTERPROXYSEARCHLINE_H
+
+// Qt
+#include <QLineEdit>
+
+class QTimer;
+class QSortFilterProxyModel;
+
+class FilterProxySearchLine : public QLineEdit
+{
+    Q_OBJECT
+
+public:
+    explicit FilterProxySearchLine(QWidget* parent = nullptr);
+
+public:
+    void setFilterProxyModel(QSortFilterProxyModel* filterProxyModel);
+
+private:
+    void updateFilter();
+
+private:
+    QTimer* m_delayTimer;
+    QSortFilterProxyModel* m_filterProxyModel = nullptr;
+};
+
+#endif
diff --git a/src/filterproxysearchline.cpp b/src/filterproxysearchline.cpp
new file mode 100644
--- /dev/null
+++ b/src/filterproxysearchline.cpp
@@ -0,0 +1,58 @@
+/*
+ * This file is part of KDevelop
+ *
+ * Copyright 2018 Friedrich W. H. Kossebau <kossebau@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "filterproxysearchline.h"
+
+// KF
+#include <KLocalizedString>
+// Qt
+#include <QTimer>
+#include <QSortFilterProxyModel>
+
+
+FilterProxySearchLine::FilterProxySearchLine(QWidget *parent)
+    : QLineEdit(parent)
+    , m_delayTimer(new QTimer(this))
+{
+    setClearButtonEnabled(true);
+    setPlaceholderText(i18n("Search"));
+
+    m_delayTimer->setSingleShot(true);
+    m_delayTimer->setInterval(300);
+    connect(m_delayTimer, &QTimer::timeout,
+            this, &FilterProxySearchLine::updateFilter);
+    connect(this, &FilterProxySearchLine::textChanged,
+            m_delayTimer, static_cast<void(QTimer::*)()>(&QTimer::start));
+}
+
+void FilterProxySearchLine::setFilterProxyModel(QSortFilterProxyModel* filterProxyModel)
+{
+    m_filterProxyModel = filterProxyModel;
+}
+
+void FilterProxySearchLine::updateFilter()
+{
+    if (!m_filterProxyModel) {
+        return;
+    }
+
+    m_filterProxyModel->setFilterFixedString(text());
+}
diff --git a/src/kwordquiz.h b/src/kwordquiz.h
--- a/src/kwordquiz.h
+++ b/src/kwordquiz.h
@@ -27,13 +27,14 @@
 #include <QUrl>
 #include <QUndoStack>
 
+#include "filterproxysearchline.h"
 #include "kwqquizmodel.h"
 
 class KActionMenu;
 class KRecentFilesAction;
 class KPageWidget;
 class KPageWidgetItem;
-class KFilterProxySearchLine;
+class FilterProxySearchLine;
 class KEduVocDocument;
 class KWQTableModel;
 class KWQSortFilterModel;
@@ -249,7 +250,7 @@
 
     KWordQuizPrefs *m_prefDialog;
 
-    KFilterProxySearchLine *m_searchLine;
+    FilterProxySearchLine *m_searchLine;
 
     /** m_doc represents your actual document and is created only once. It keeps
      * information such as filename and does the serialization of your files.
diff --git a/src/kwordquiz.cpp b/src/kwordquiz.cpp
--- a/src/kwordquiz.cpp
+++ b/src/kwordquiz.cpp
@@ -32,7 +32,7 @@
 
 #include <kactioncollection.h>
 #include <kactionmenu.h>
-#include <kapplication.h>
+//#include <QApplication>
 #include <kmessagebox.h>
 #include <klocalizedstring.h>
 #include <kedittoolbar.h>
@@ -50,13 +50,13 @@
 #include <KProcess>
 #include <QTemporaryFile>
 #include <kwindowsystem.h>
-#include <KFilterProxySearchLine>
 #include <KConfigGroup>
 #include <QStandardPaths>
 #include <KUndoActions>
 #include <QMimeDatabase>
 #include <QMimeType>
 
+#include "filterproxysearchline.h"
 #include "keduvocdocument.h"
 #include "keduvoclesson.h"
 #include "keduvocexpression.h"
@@ -461,8 +461,7 @@
 
   updateSpecialCharIcons();
 
-  if (!initialGeometrySet())
-    resize( QSize(650, 450).expandedTo(minimumSizeHint()));
+  resize( QSize(650, 450).expandedTo(minimumSizeHint()));
   setupGUI(ToolBar | Keys | StatusBar | Create);
   setAutoSaveSettings();
 
@@ -518,10 +517,10 @@
   QVBoxLayout *editorLayout = new QVBoxLayout();
   editorLayout->setMargin(0);
 
-  m_searchLine = new KFilterProxySearchLine(this);
-  m_searchLine->lineEdit()->setFocusPolicy(Qt::ClickFocus);
-  m_searchLine->lineEdit()->setPlaceholderText(i18n("Enter search terms here"));
-  m_searchLine->setProxy(m_sortFilterModel);
+  m_searchLine = new FilterProxySearchLine(this);
+  m_searchLine->setFocusPolicy(Qt::ClickFocus);
+  m_searchLine->setPlaceholderText(i18n("Enter search terms here"));
+  m_searchLine->setFilterProxyModel(m_sortFilterModel);
 
   m_tableView = new KWQTableView(m_undoStack, this);
   editorLayout->addWidget(m_searchLine);
@@ -699,16 +698,13 @@
   bool modified = _cfg.readEntry("modified", false);
   if(modified)
   {
-    bool canRecover;
-    QString tempname = kapp->checkRecoverFile(filename, canRecover);
-    QUrl _url(tempname);
-
-    if(canRecover)
-    {
-      m_doc->open(_url);
-      setWindowTitle(_url.fileName() + "[*]");
-      setWindowModified(true);
-      QFile::remove(tempname);
+    QTemporaryFile tmpfile(filename);
+    if (tmpfile.open()) {
+        QUrl _url(QUrl::fromLocalFile(tmpfile.fileName()));
+        m_doc->open(_url);
+        m_doc->setModified();
+        setWindowTitle(_url.fileName() + "[*]");
+        setWindowModified(true);
     }
   }
   else
diff --git a/src/kwqcardscene.cpp b/src/kwqcardscene.cpp
--- a/src/kwqcardscene.cpp
+++ b/src/kwqcardscene.cpp
@@ -148,7 +148,7 @@
 
 void KWQCardScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
 {
-    QGraphicsItem *item = itemAt(mouseEvent->scenePos());
+    QGraphicsItem *item = itemAt(mouseEvent->scenePos(), QTransform());
     if (item != 0)
         emit cardClicked();
     QGraphicsScene::mouseReleaseEvent(mouseEvent);
diff --git a/src/kwqcleardialog.cpp b/src/kwqcleardialog.cpp
--- a/src/kwqcleardialog.cpp
+++ b/src/kwqcleardialog.cpp
@@ -41,11 +41,10 @@
     okButton->setShortcut(Qt::CTRL | Qt::Key_Return);
     connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
     connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
-    //PORTING SCRIPT: WARNING mainLayout->addWidget(buttonBox) must be last item in layout. Please move it.
     mainLayout->addWidget(buttonBox);
     setupUi(mainWidget);
 
-    connect(clearButtonGroup, &KButtonGroup::changed, this, &KWQClearDialog::buttonGroupChanged);
+    connect(clearButtonGroup, &QGroupBox::clicked, this, &KWQClearDialog::buttonGroupChanged);
 
     updateCheckBoxes();
 }
diff --git a/src/kwqtablemodel.cpp b/src/kwqtablemodel.cpp
--- a/src/kwqtablemodel.cpp
+++ b/src/kwqtablemodel.cpp
@@ -213,8 +213,9 @@
 
 void KWQTableModel::setDocument(KEduVocDocument * doc)
 {
+  beginResetModel();
   m_doc = doc;
-  reset();
+  endResetModel();
 }
 
 bool KWQTableModel::isEmpty()
diff --git a/src/kwqtableview.h b/src/kwqtableview.h
--- a/src/kwqtableview.h
+++ b/src/kwqtableview.h
@@ -81,6 +81,7 @@
   void verticalHeaderResized(int, int, int);
   void horizontalHeaderResized(int, int, int);
   void horizontalHeaderDataChanged(Qt::Orientation, int, int);
+  void slotPrintPreviewRequested(QPrinter* printer);
 
 private:
   // Disable from public calling; use setFilterModel() instead.
diff --git a/src/kwqtableview.cpp b/src/kwqtableview.cpp
--- a/src/kwqtableview.cpp
+++ b/src/kwqtableview.cpp
@@ -17,28 +17,27 @@
 
 #include "kwqtableview.h"
 
+#include <QAbstractTextDocumentLayout>
+#include <QApplication>
+#include <QDBusInterface>
+#include <QDebug>
 #include <QFile>
-#include <QPointer>
-#include <QLineEdit>
+#include <QFileDialog>
+#include <QHeaderView>
+#include <QImageReader>
 #include <QKeyEvent>
+#include <QLineEdit>
 #include <QList>
-#include <QApplication>
-#include <QPrinter>
+#include <QPointer>
 #include <QPrintDialog>
-#include <QFileDialog>
+#include <QPrintPreviewDialog>
+#include <QPrinter>
 #include <QTextCursor>
-#include <QTextTable>
 #include <QTextLayout>
-#include <QAbstractTextDocumentLayout>
-#include <QHeaderView>
-#include <QDBusInterface>
-#include <QDebug>
+#include <QTextTable>
 
 #include <KLocalizedString>
 #include <KNotification>
-#include <kdeprintdialog.h>
-#include <KPrintPreview>
-#include <KFileDialog>
 #include <KConfigGroup>
 
 #include "kwqtablemodel.h"
@@ -78,7 +77,8 @@
 
   WQPrintDialogPage * p = new WQPrintDialogPage(this);
   p->setPrintStyle(Prefs::printStyle());
-  QPrintDialog *printDialog = KdePrint::createPrintDialog(&printer, QList<QWidget*>() << p, this);
+  QPrintDialog *printDialog = new QPrintDialog(&printer, this);
+  printDialog->setOptionTabs(QList<QWidget*>() << p);
   if (printDialog->exec() == QDialog::Accepted) {
     Prefs::setPrintStyle(p->printStyle());
     QTextDocument td;
@@ -90,11 +90,17 @@
 void KWQTableView::doPrintPreview()
 {
   QPrinter printer;
-  QPointer<KPrintPreview> preview = new KPrintPreview(&printer, this);
+  QPrintPreviewDialog preview(&printer);
+  
+  connect(&preview, &QPrintPreviewDialog::paintRequested, this, &KWQTableView::slotPrintPreviewRequested);
+  
+  preview.exec();
+}
+
+void KWQTableView::slotPrintPreviewRequested(QPrinter* printer)
+{
   QTextDocument td;
-  createPages(&printer, &td, true);
-  preview->exec();
-  delete preview;
+  KWQTableView::createPages(printer, &td, true);
 }
 
 bool KWQTableView::doHtmlExport(const QUrl &url)
@@ -717,11 +723,23 @@
 void KWQTableView::doVocabImage()
 {
   QUrl currentUrl(model()->data(currentIndex(), KWQTableModel::ImageRole).toString());
+  QStringList imageFormats;
+  for(const QByteArray b: QImageReader::supportedMimeTypes()) {
+      if (! b.isEmpty()) imageFormats.append(QString(b));
+  }
 
-  QUrl imageUrl = KFileDialog::getImageOpenUrl(currentUrl, this, i18n("Select Image"));
-  if (!imageUrl.isEmpty()) {
-    KWQCommandImage *kwqc = new KWQCommandImage(this, imageUrl);
-    m_undoStack->push(kwqc);
+  QFileDialog imageOpenDialog(this);
+  imageOpenDialog.setWindowTitle(i18nc("@title:window", "Select Image"));
+  imageOpenDialog.setDirectory(currentUrl.path());
+  imageOpenDialog.setMimeTypeFilters(imageFormats);
+  imageOpenDialog.setAcceptMode(QFileDialog::AcceptOpen);
+  imageOpenDialog.setFileMode(QFileDialog::ExistingFile);
+  if (imageOpenDialog.exec() == QDialog::Accepted) {
+      QUrl imageUrl = QUrl::fromLocalFile(imageOpenDialog.selectedFiles().first());
+      if (!imageUrl.isEmpty()) {
+          KWQCommandImage *kwqc = new KWQCommandImage(this, imageUrl);
+          m_undoStack->push(kwqc);
+      }
   }
 }
 
@@ -730,7 +748,7 @@
 {
   QUrl currentUrl(model()->data(currentIndex(), KWQTableModel::SoundRole).toString());
 
-  QUrl soundUrl = QFileDialog::getOpenFileUrl(this, i18n("Select Sound"), currentUrl, i18n("*|All Files"));
+  QUrl soundUrl = QFileDialog::getOpenFileUrl(this, i18n("Select Sound"), currentUrl, i18n("All Files (*)"));
   if (!soundUrl.isEmpty()) {
     KWQCommandSound *kwqc = new KWQCommandSound(this, soundUrl);
     m_undoStack->push(kwqc);
diff --git a/src/kwqtutor.cpp b/src/kwqtutor.cpp
--- a/src/kwqtutor.cpp
+++ b/src/kwqtutor.cpp
@@ -26,7 +26,7 @@
 #include <KActionCollection>
 #include <KStandardAction>
 #include <KMessageBox>
-#include <KFileDialog>
+#include <QFileDialog>
 #include <KLocalizedString>
 #include <KConfigGroup>
 #include <KIconLoader>
@@ -140,14 +140,12 @@
 void KWQTutor::loadFile()
 {
   QString filter = KEduVocDocument::pattern(KEduVocDocument::Reading);
-  QPointer<KFileDialog> fd = new KFileDialog(QUrl(), filter, 0);
-  fd->setOperationMode(KFileDialog::Opening);
-  fd->setMode(KFile::File | KFile::ExistingOnly);
-  fd->setWindowTitle(i18n("Open Vocabulary Document"));
+  QPointer<QFileDialog> fd = new QFileDialog(nullptr, i18n("Open Vocabulary Document"), QString(), filter);
+  fd->setFileMode(QFileDialog::ExistingFiles);
   if (fd->exec() == QDialog::Accepted)
   {
-    m_tutorDoc->open(fd->selectedUrl());
-    Prefs::setLastVocabFile(fd->selectedUrl().toLocalFile());
+    m_tutorDoc->open(fd->selectedUrls().at(0));
+    Prefs::setLastVocabFile(fd->selectedUrls().at(0).toLocalFile());
     if (Prefs::startExerciseAsSoonAsFileIsLoaded())
       startStopPressed();
   }
diff --git a/src/preftutor.cpp b/src/preftutor.cpp
--- a/src/preftutor.cpp
+++ b/src/preftutor.cpp
@@ -21,7 +21,7 @@
 PrefTutor::PrefTutor(QWidget *parent) : QWidget(parent)
 {
   setupUi(this);
-  connect(kcfg_TutorTiming, &KButtonGroup::changed, this, &PrefTutor::timingChanged);
+  connect(kcfg_TutorTiming, &QGroupBox::clicked, this, &PrefTutor::timingChanged);
 }
 
 void PrefTutor::timingChanged (int id)
diff --git a/src/preftutorbase.ui b/src/preftutorbase.ui
--- a/src/preftutorbase.ui
+++ b/src/preftutorbase.ui
@@ -12,7 +12,7 @@
   </property>
   <layout class="QGridLayout" name="gridLayout_4">
    <item row="0" column="0">
-    <widget class="KButtonGroup" name="kcfg_TutorTiming">
+    <widget class="QGroupBox" name="kcfg_TutorTiming">
      <property name="title">
       <string>Tutor Timing</string>
      </property>
@@ -156,7 +156,7 @@
     </widget>
    </item>
    <item row="1" column="0">
-    <widget class="KButtonGroup" name="kcfg_TutorCardAppearance">
+    <widget class="QGroupBox" name="kcfg_TutorCardAppearance">
      <property name="title">
       <string>Flashcard Appearance</string>
      </property>
@@ -215,14 +215,6 @@
    </item>
   </layout>
  </widget>
- <customwidgets>
-  <customwidget>
-   <class>KButtonGroup</class>
-   <extends>QGroupBox</extends>
-   <header>kbuttongroup.h</header>
-   <container>1</container>
-  </customwidget>
- </customwidgets>
  <tabstops>
   <tabstop>kcfg_StartExerciseAsSoonAsFileIsLoaded</tabstop>
  </tabstops>