Clean up print duplication and conditional compilation

src/kiwixapp.cpp

@@ -216,21 +216,17 @@ void KiwixApp::printPage()
         if(!webview)
             return;
 
+    const auto onPrintFinished = [=](bool success) {
+        if (!success) {
+            showMessage(gt("print-page-error"), gt("error-title"), QMessageBox::Critical);
+        }
+        delete printer;
+    };
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-        webview->page()->print(printer, [=](bool success) {
-            if (!success) {
-                showMessage(gt("print-page-error"), gt("error-title"), QMessageBox::Critical);
-            }
-            delete printer;
-        });
+        webview->page()->print(printer, onPrintFinished);
 #else
         webview->print(printer);
-        connect(webview, &QWebEngineView::printFinished, this, [=](bool success) {
-            if (!success) {
-                showMessage(gt("print-page-error"), gt("error-title"), QMessageBox::Critical);
-            }
-            delete printer;
-        });
+        connect(webview, &QWebEngineView::printFinished, this, onPrintFinished);
 #endif
     }
 }

src/settingsmanager.cpp

@@ -150,15 +150,21 @@ void SettingsManager::initSettings()
     m_moveToTrash = m_settings.value("moveToTrash", true).toBool();
     QString defaultLang = QLocale::languageToString(QLocale().language()) + '|' + QLocale().name().split("_").at(0);
 
-    QList<QString> defaultLangList; // Qt5 QList doesn't support supplying a constructor list, so use append() for Qt5+Qt6 compat
+    /*
+     * Qt5 & Qt6 have slightly different behaviors with regards to initializing QVariant.
+     * The below approach is specifically chosen to work with both versions.
+     * m_langList initialized with defaultLang should be of the form:
+     *
+     * (QVariant(QString, "English|en"))
+     *
+     * and not
+     *
+     * QList(QVariant(QChar, 'E'), QVariant(QChar, 'n'), QVariant(QChar, 'g'), ...
+     */
+    QList<QString> defaultLangList; // Qt5 QList doesn't support supplying a constructor list
     defaultLangList.append(defaultLang);
-
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    QVariant defaultLangVariant(defaultLangList); // Qt5 requires explicit conversion from QList to QVariant
+    QVariant defaultLangVariant(defaultLangList);
     m_langList = m_settings.value("language", defaultLangVariant).toList();
-#else
-    m_langList = m_settings.value("language", defaultLangList).toList();
-#endif
 
     m_categoryList = m_settings.value("category", {}).toList();
     m_contentTypeList = m_settings.value("contentType", {}).toList();

subprojects/QtSingleApplication/src/qtlockedfile.h

@@ -66,9 +66,6 @@ namespace QtLP_Private {
 
 class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile
 {
-    //Q_OBJECT
-    // TODO: Uncomment Q_OBJECT. Setting Q_OBJECT here causes this error:
-    // undefined reference to `vtable for QtLP_Private::QtLockedFile'
 public:
     enum LockMode { NoLock = 0, ReadLock, WriteLock };