set zoom factor after page has finished loading

This fixes the problem of page not getting the correct zoom factor (after accessing an article from searchbar)
Now, the zoom factor is set again after page has completely finished loading

src/webview.cpp

@@ -40,6 +40,29 @@ void WebViewForwardMenu::showEvent(QShowEvent *)
     setGeometry(geo);
 }
 
+QString getZimIdFromUrl(QUrl url)
+{
+    return url.host().split('.')[0];
+}
+
+QString getResultTypeFromUrl(QUrl url)
+{
+    return url.host().split('.')[1];
+}
+
+void WebView::applyCorrectZoomFactor() {
+    auto url = this->url();
+    auto settingsManager = KiwixApp::instance()->getSettingsManager();
+    qreal zoomFactor;
+    const bool isSearchResultsView = QUrlQuery(url).hasQueryItem("pattern") && (getResultTypeFromUrl(url) == "search");
+    if (isSearchResultsView) {
+        zoomFactor = settingsManager->getZoomFactor();
+    } else {
+        auto zimId = getZimIdFromUrl(url);
+        zoomFactor = settingsManager->getZoomFactorByZimId(zimId);
+    }
+    this->setZoomFactor(zoomFactor);
+}
 
 WebView::WebView(QWidget *parent)
     : QWebEngineView(parent)
@@ -49,6 +72,18 @@ WebView::WebView(QWidget *parent)
     connect(this->page(), &QWebEnginePage::linkHovered, this, [=] (const QString& url) {
         m_linkHovered = url;
     });
+
+    /* In Qt 5.12, the zoom factor is not correctly passed after a fulltext search
+     * Bug Report: https://bugreports.qt.io/browse/QTBUG-51851
+     * This rezooms the page to its correct zoom (default/by ZIM ID) after loading is finished.
+     * If the page is search results, we put the default zoom factor
+     * If in Qt 6.x, the bug is fixed this code can be removed.
+     */
+    connect(this, &QWebEngineView::loadFinished, this, [=] (bool ok) {
+        if (ok) {
+            applyCorrectZoomFactor();
+        }
+    });
 }
 
 WebView::~WebView()
@@ -125,7 +160,7 @@ QWebEngineView* WebView::createWindow(QWebEnginePage::WebWindowType type)
 }
 
 void WebView::onUrlChanged(const QUrl& url) {
-    auto zimId = url.host().split('.')[0];
+    auto zimId = getZimIdFromUrl(url);
     if (m_currentZimId == zimId ) {
         return;
     }

src/webview.h

@@ -69,6 +69,7 @@ private slots:
 
 private:
     void addHistoryItemAction(QMenu *menu, const QWebEngineHistoryItem &item, int n) const;
+    void applyCorrectZoomFactor();
 };
 
 #endif // WEBVIEW_H