refactor: remove unused strings

src/lib/gui/VersionChecker.cpp

@@ -108,9 +108,6 @@ int VersionChecker::compareVersions(const QString &left, const QString &right)
   QStringList leftParts = left.split("-");
   QStringList rightParts = right.split("-");
 
-  QString leftNumber = leftParts.at(0);
-  QString rightNumber = rightParts.at(0);
-
   QStringList leftNumberParts = left.split(".");
   QStringList rightNumberParts = right.split(".");
 

src/lib/gui/core/ClientConnection.cpp

@@ -69,7 +69,6 @@ void ClientConnection::showMessage(const QString &logLine)
   emit messageShowing();
 
   const auto address = m_appConfig.serverHostname();
-  auto message = QString("<p>The connection to server '%1' didn't work.</p>").arg(address);
 
   if (logLine.contains("server already has a connected client with our name")) {
     m_deps->showError(m_pParent, AlreadyConnected, address);

src/lib/gui/core/CoreProcess.cpp

@@ -645,7 +645,6 @@ bool CoreProcess::addClientArgs(QStringList &args, QString &app)
 
 QString CoreProcess::persistServerConfig() const
 {
-  QString configFullPath;
   if (m_appConfig.useExternalConfig()) {
     return m_appConfig.configFile();
   }