Fix crash when restoring history of internal pages with QtWebEngine 5.8

Closes #2302

src/lib/webengine/webview.cpp

@@ -258,12 +258,6 @@ QRect WebView::scrollBarGeometry(Qt::Orientation orientation) const
     return s && s->isVisible() ? s->geometry() : QRect();
 }
 
-void WebView::restoreHistory(const QByteArray &data)
-{
-    QDataStream stream(data);
-    stream >> *history();
-}
-
 QWidget *WebView::inputWidget() const
 {
     return m_rwhvqt ? m_rwhvqt : const_cast<WebView*>(this);

src/lib/webengine/webview.h

@@ -60,8 +60,6 @@ public:
     QPointF mapToViewport(const QPointF &pos) const;
     QRect scrollBarGeometry(Qt::Orientation orientation) const;
 
-    void restoreHistory(const QByteArray &data);
-
     void addNotification(QWidget* notif);
     bool eventFilter(QObject *obj, QEvent *event);
 

src/lib/webtab/webtab.cpp

@@ -300,11 +300,6 @@ void WebTab::attach(BrowserWindow* window)
     m_tabIcon->updateIcon();
 }
 
-void WebTab::setHistoryData(const QByteArray &data)
-{
-    m_webView->restoreHistory(data);
-}
-
 QByteArray WebTab::historyData() const
 {
     if (isRestored()) {
@@ -413,7 +408,18 @@ void WebTab::restoreTab(const WebTab::SavedTab &tab)
 void WebTab::p_restoreTab(const QUrl &url, const QByteArray &history, int zoomLevel)
 {
     m_webView->load(url);
-    m_webView->restoreHistory(history);
+
+    // Restoring history of internal pages crashes QtWebEngine 5.8
+    static const QStringList blacklistedSchemes = {
+        QSL("view-source"),
+        QSL("chrome")
+    };
+
+    if (!blacklistedSchemes.contains(url.scheme())) {
+        QDataStream stream(history);
+        stream >> *m_webView->history();
+    }
+
     m_webView->setZoomLevel(zoomLevel);
     m_webView->setFocus();
 }

src/lib/webtab/webtab.h

@@ -73,7 +73,6 @@ public:
     void detach();
     void attach(BrowserWindow* window);
 
-    void setHistoryData(const QByteArray &data);
     QByteArray historyData() const;
 
     void stop();