Fix compilation with Qt < 5.14

src/dialogs/renderwidget.cpp

@@ -336,7 +336,11 @@ void RenderWidget::slotShareActionFinished(const QJsonObject &output, int error,
 QSize RenderWidget::sizeHint() const
 {
     // Make sure the widget has minimum size on opening
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    return {200, 200};
+#else
     return {200, qMax(200, screen()->availableGeometry().height())};
+#endif
 }
 
 RenderWidget::~RenderWidget()