Fix compilation against Qt < 5.15 for Leap 15.3 builds

syncthingconnector/syncthingconnection.h

@@ -730,7 +730,7 @@ inline int SyncthingConnection::requestTimeout() const
 
 /*!
  * \brief Sets the transfer timeout for requests in milliseconds.
- * \remarks Existing requests are not affected.
+ * \remarks Existing requests are not affected. Only effective when compiled against Qt 5.15 or higher.
  * \sa QNetworkRequest::setTransferTimeout()
  */
 inline void SyncthingConnection::setRequestTimeout(int requestTimeout)

syncthingconnector/syncthingconnection_requests.cpp

@@ -43,7 +43,9 @@ QNetworkRequest SyncthingConnection::prepareRequest(const QString &path, const Q
     QNetworkRequest request(url);
     request.setHeader(QNetworkRequest::ContentTypeHeader, QByteArrayLiteral("application/x-www-form-urlencoded"));
     request.setRawHeader("X-API-Key", m_apiKey);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     request.setTransferTimeout(noTimeout ? 0 : m_requestTimeout);
+#endif
     return request;
 }
 

syncthingwidgets/settings/settingsdialog.cpp

@@ -131,6 +131,9 @@ QWidget *ConnectionOptionPage::setupWidget()
     QObject::connect(ui()->upPushButton, &QPushButton::clicked, bind(&ConnectionOptionPage::moveSelectedConfigUp, this));
     QObject::connect(ui()->addPushButton, &QPushButton::clicked, bind(&ConnectionOptionPage::addNewConfig, this));
     QObject::connect(ui()->removePushButton, &QPushButton::clicked, bind(&ConnectionOptionPage::removeSelectedConfig, this));
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
+    ui()->timeoutSpinBox->setEnabled(false);
+#endif
     return widget;
 }