Try lock implementation with std::unique_lock

src/gui/CMakeLists.txt

@@ -125,7 +125,7 @@ set(client_SRCS
     synchronizeditem.h synchronizeditem.cpp
     synchronizeditemwidget.h synchronizeditemwidget.cpp
     synthesispopover.h synthesispopover.cpp
-        updater/updatedialog.h updater/updatedialog.cpp
+    updater/updatedialog.h updater/updatedialog.cpp
     userselectionwidget.h userselectionwidget.cpp
     customextensionsetupwidget.h customextensionsetupwidget.cpp
     customlabel.h customlabel.cpp

src/gui/clientgui.cpp

@@ -758,17 +758,16 @@ void ClientGui::onNewDriveWizard() {
     raiseDialog(_addDriveWizard.get());
 }
 
-void ClientGui::onShowWindowsUpdateDialog(const VersionInfo &versionInfo) {
-    static LockUtility lock;
-    if (!lock.lock()) return;
+
+void ClientGui::onShowWindowsUpdateDialog(const VersionInfo &versionInfo) const {
+    static std::mutex mutex;
+    if (const std::unique_lock lock(mutex, std::try_to_lock); !lock.owns_lock()) return;
 
     if (UpdateDialog dialog(versionInfo); dialog.exec() == QDialog::Accepted) {
         GuiRequests::startInstaller();
     } else if (dialog.skip()) {
         GuiRequests::skipUpdate(versionInfo.fullVersion());
     }
-
-    lock.unlock();
 }
 
 void ClientGui::onDisableNotifications(NotificationsDisabled type, QDateTime value) {

src/gui/clientgui.h

@@ -115,7 +115,7 @@ class ClientGui : public QObject, public std::enable_shared_from_this<ClientGui>
         void onErrorsCleared(int syncDbId);
         void onFixConflictingFilesCompleted(int syncDbId, uint64_t nbErrors);
         void onNewDriveWizard();
-        void onShowWindowsUpdateDialog(const VersionInfo &versionInfo);
+        void onShowWindowsUpdateDialog(const KDC::VersionInfo &versionInfo) const;
 
     private:
         QScopedPointer<Systray> _tray;