LanguageClient: prevent accessing freed data on shutdown

Change-Id: I0d6e7abd653acb2ab7409a9cd5e58a2df3b1f259
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/languageclient/client.cpp

@@ -190,19 +190,23 @@ public:
         // temporary container needed since m_resetAssistProvider is changed in resetAssistProviders
         for (TextDocument *document : m_resetAssistProvider.keys())
             resetAssistProviders(document);
+        if (!LanguageClientManager::isShuttingDown()) {
+            // prevent accessing deleted editors on Creator shutdown
             const QList<Core::IEditor *> &editors = Core::DocumentModel::editorsForOpenedDocuments();
             for (Core::IEditor *editor : editors) {
                 if (auto textEditor = qobject_cast<BaseTextEditor *>(editor)) {
                     TextEditorWidget *widget = textEditor->editorWidget();
-                widget->setRefactorMarkers(RefactorMarker::filterOutType(widget->refactorMarkers(), m_id));
+                    widget->setRefactorMarkers(
+                        RefactorMarker::filterOutType(widget->refactorMarkers(), m_id));
                     widget->removeHoverHandler(&m_hoverHandler);
                 }
             }
+            updateEditorToolBar(m_openedDocument.keys());
+        }
         for (IAssistProcessor *processor : qAsConst(m_runningAssistProcessors))
             processor->setAsyncProposalAvailable(nullptr);
         qDeleteAll(m_documentHighlightsTimer);
         m_documentHighlightsTimer.clear();
-        updateEditorToolBar(m_openedDocument.keys());
         // do not handle messages while shutting down
         disconnect(m_clientInterface, &InterfaceController::messageReceived,
                    q, &Client::handleMessage);

src/plugins/languageclient/languageclientmanager.cpp

@@ -232,6 +232,11 @@ void LanguageClientManager::shutdown()
     });
 }
 
+bool LanguageClientManager::isShuttingDown()
+{
+    return managerInstance->m_shuttingDown;
+}
+
 LanguageClientManager *LanguageClientManager::instance()
 {
     return managerInstance;

src/plugins/languageclient/languageclientmanager.h

@@ -50,6 +50,7 @@ public:
     static void deleteClient(Client *client);
 
     static void shutdown();
+    static bool isShuttingDown();
 
     static LanguageClientManager *instance();