1 files changed, 39 insertions, 22 deletions

diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 477cbc70..c3a19bf4 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -266,6 +266,8 @@ MainWindow::MainWindow(Settings &settings
   , m_LinkToolbar(nullptr)
   , m_LinkDesktop(nullptr)
   , m_LinkStartMenu(nullptr)
+  , m_NumberOfProblems(0)
+  , m_ProblemsCheckRequired(false)
 {
   // disables incredibly slow menu fade in effect that looks and feels like crap.
   // this was only happening to users with the windows
@@ -400,7 +402,7 @@ MainWindow::MainWindow(Settings &settings
     ui->bossButton->setToolTip(tr("There is no supported sort mechanism for this game. You will probably have to use a third-party tool."));
   }
 
-  connect(&m_PluginContainer, SIGNAL(diagnosisUpdate()), this, SLOT(updateProblemsButton()));
+  connect(&m_PluginContainer, SIGNAL(diagnosisUpdate()), this, SLOT(scheduleCheckForProblems()));
 
   connect(ui->savegameList, SIGNAL(itemEntered(QListWidgetItem*)), this, SLOT(saveSelectionChanged(QListWidgetItem*)));
 
@@ -473,7 +475,8 @@ MainWindow::MainWindow(Settings &settings
   setFilterShortcuts(ui->downloadView, ui->downloadFilterEdit);
 
   m_UpdateProblemsTimer.setSingleShot(true);
-  connect(&m_UpdateProblemsTimer, SIGNAL(timeout()), this, SLOT(updateProblemsButton()));
+  connect(&m_UpdateProblemsTimer, &QTimer::timeout, this, &MainWindow::checkForProblemsAsync);
+  connect(this, &MainWindow::checkForProblemsDone, this, &MainWindow::updateProblemsButton, Qt::ConnectionType::QueuedConnection);
 
   m_SaveMetaTimer.setSingleShot(false);
   connect(&m_SaveMetaTimer, SIGNAL(timeout()), this, SLOT(saveModMetas()));
@@ -1000,21 +1003,19 @@ void MainWindow::on_centralWidget_customContextMenuRequested(const QPoint &pos)
   createPopupMenu()->exec(ui->centralWidget->mapToGlobal(pos));
 }
 
-void MainWindow::scheduleUpdateButton()
+void MainWindow::scheduleCheckForProblems()
 {
   if (!m_UpdateProblemsTimer.isActive()) {
-    m_UpdateProblemsTimer.start(1000);
+    m_UpdateProblemsTimer.start(500);
   }
 }
 
 void MainWindow::updateProblemsButton()
 {
-  TimeThis tt("MainWindow::updateProblemsButton()");
-
   // if the current stylesheet doesn't provide an icon, this is used instead
   const char* DefaultIconName = ":/MO/gui/warning";
 
-  const std::size_t numProblems = checkForProblems();
+  const std::size_t numProblems = m_NumberOfProblems;
 
   // original icon without a count painted on it
   const QIcon original = m_originalNotificationIcon.isNull() ?
@@ -1097,19 +1098,34 @@ bool MainWindow::errorReported(QString &logFile)
   return false;
 }
 
+QFuture<void> MainWindow::checkForProblemsAsync() {
+  return QtConcurrent::run([this]() {
+    checkForProblemsImpl();
+    });
+}
 
-size_t MainWindow::checkForProblems()
+void MainWindow::checkForProblemsImpl()
 {
-  size_t numProblems = 0;
-  for (QObject *pluginObj : m_PluginContainer.plugins<QObject>()) {
-    IPlugin *plugin = qobject_cast<IPlugin*>(pluginObj);
-    if (plugin == nullptr || plugin->isActive()) {
-      IPluginDiagnose *diagnose = qobject_cast<IPluginDiagnose*>(pluginObj);
-      if (diagnose != nullptr)
-        numProblems += diagnose->activeProblems().size();
+  m_ProblemsCheckRequired = true;
+
+  std::scoped_lock lk(m_CheckForProblemsMutex);
+
+  // another thread might already have checked while this one was waiting on the lock
+  if (m_ProblemsCheckRequired) {
+    m_ProblemsCheckRequired = false;
+    TimeThis tt("MainWindow::checkForProblemsImpl()");
+    size_t numProblems = 0;
+    for (QObject *pluginObj : m_PluginContainer.plugins<QObject>()) {
+      IPlugin *plugin = qobject_cast<IPlugin*>(pluginObj);
+      if (plugin == nullptr || plugin->isActive()) {
+        IPluginDiagnose *diagnose = qobject_cast<IPluginDiagnose*>(pluginObj);
+        if (diagnose != nullptr)
+          numProblems += diagnose->activeProblems().size();
+      }
     }
+    m_NumberOfProblems = numProblems;
+    emit checkForProblemsDone();
   }
-  return numProblems;
 }
 
 void MainWindow::about()
@@ -1353,7 +1369,7 @@ void MainWindow::showEvent(QShowEvent *event)
 
     m_OrganizerCore.settings().nexus().registerAsNXMHandler(false);
     m_WasVisible = true;
-	  updateProblemsButton();
+    updateProblemsButton();
   }
 }
 
@@ -2456,7 +2472,7 @@ void MainWindow::directory_refreshed()
 {
   // some problem-reports may rely on the virtual directory tree so they need to be updated
   // now
-  updateProblemsButton();
+  scheduleCheckForProblems();
 
   //Some better check for the current tab is needed.
   if (ui->tabWidget->currentIndex() == 2) {
@@ -3782,7 +3798,7 @@ void MainWindow::clearOverwrite()
       for (auto f : overwriteDir.entryList(QDir::AllDirs | QDir::Files | QDir::NoDotAndDotDot))
         delList.push_back(overwriteDir.absoluteFilePath(f));
       if (shellDelete(delList, true)) {
-        updateProblemsButton();
+        scheduleCheckForProblems();
         m_OrganizerCore.refreshModList();
       } else {
         const auto e = GetLastError();
@@ -5162,7 +5178,6 @@ void MainWindow::languageChange(const QString &newLanguage)
   createHelpMenu();
 
   updateDownloadView();
-  updateProblemsButton();
 
   QMenu *listOptionsMenu = new QMenu(ui->listOptionsBtn);
   initModListContextMenu(listOptionsMenu);
@@ -5869,12 +5884,14 @@ void MainWindow::on_bsaList_itemChanged(QTreeWidgetItem*, int)
 
 void MainWindow::on_actionNotifications_triggered()
 {
-  updateProblemsButton();
+  auto future = checkForProblemsAsync();
+
+  future.waitForFinished();
 
   ProblemsDialog problems(m_PluginContainer.plugins<QObject>(), this);
   problems.exec();
 
-  updateProblemsButton();
+  scheduleCheckForProblems();
 }
 
 void MainWindow::on_actionChange_Game_triggered()