Resize WebView widget once the loginpage rendered

When the login dialogue displays the login page itself
the WebView widget did not resize according to
the dimensions of the login page.

Signed-off-by: Axel Lender <lender@b1-systems.de>

src/gui/wizard/webview.cpp

@@ -111,12 +111,30 @@ WebView::WebView(QWidget *parent)
 
     connect(_webview, &QWebEngineView::loadProgress, _ui.progressBar, &QProgressBar::setValue);
     connect(_schemeHandler, &WebViewPageUrlSchemeHandler::urlCatched, this, &WebView::urlCatched);
+
+    connect(_page, &QWebEnginePage::contentsSizeChanged, this, &WebView::slotResizeToContents);
 }
 
 void WebView::setUrl(const QUrl &url) {
     _page->setUrl(url);
 }
 
+QSize WebView::minimumSizeHint() const {
+    return _size;
+}
+
+void WebView::slotResizeToContents(const QSizeF &size){
+    //this widget also holds the progressbar
+    const int newHeight = size.toSize().height() + _ui.progressBar->height();
+    const int newWidth = size.toSize().width();
+    _size = QSize(newWidth, newHeight);
+
+    this->updateGeometry();
+
+    //only resize once
+    disconnect(_page, &QWebEnginePage::contentsSizeChanged, this, &WebView::slotResizeToContents);
+}
+
 WebView::~WebView() {
     /*
      * The Qt implmentation deletes children in the order they are added to the

src/gui/wizard/webview.h

@@ -23,13 +23,19 @@ class WebView : public QWidget
     WebView(QWidget *parent = nullptr);
     ~WebView() override;
     void setUrl(const QUrl &url);
+    virtual QSize minimumSizeHint() const override;
 
 signals:
     void urlCatched(const QString user, const QString pass, const QString host);
 
+private slots:
+    void slotResizeToContents(const QSizeF &size);
+
 private:
     Ui_WebView _ui;
 
+    QSize _size;
+
     QWebEngineView *_webview;
     QWebEngineProfile *_profile;
     WebEnginePage *_page;