From a2cb1edb690de661f36d3c66a6bf09437badd989 Mon Sep 17 00:00:00 2001
From: David Schulz <david.schulz@qt.io>
Date: Mon, 1 Nov 2021 07:25:07 +0100
Subject: [PATCH] clangd: assert on starting client for project that already
 has a client

Change-Id: Ia50662063f7f7bdc26e5a842f7c25af4f4f4efdf
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
---
 src/plugins/clangcodemodel/clangdclient.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/plugins/clangcodemodel/clangdclient.cpp b/src/plugins/clangcodemodel/clangdclient.cpp
index eef6e5e5730..00ad74279e3 100644
--- a/src/plugins/clangcodemodel/clangdclient.cpp
+++ b/src/plugins/clangcodemodel/clangdclient.cpp
@@ -52,6 +52,7 @@
 #include <cppeditor/cppvirtualfunctionproposalitem.h>
 #include <cppeditor/semantichighlighter.h>
 #include <languageclient/languageclientinterface.h>
+#include <languageclient/languageclientmanager.h>
 #include <languageclient/languageclientutils.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/projecttree.h>
@@ -1197,6 +1198,15 @@ ClangdClient::ClangdClient(Project *project, const Utils::FilePath &jsonDbDir)
         initOptions.insert("fallbackFlags", QJsonArray::fromStringList(clangOptions));
         setInitializationOptions(initOptions);
     }
+    auto isRunningClangdClient = [](const LanguageClient::Client *c) {
+        return qobject_cast<const ClangdClient *>(c) && c->state() != Client::ShutdownRequested
+               && c->state() != Client::Shutdown;
+    };
+    const QList<Client *> clients =
+        Utils::filtered(LanguageClientManager::clientsForProject(project), isRunningClangdClient);
+    QTC_CHECK(clients.isEmpty());
+    for (const Client *client : clients)
+        qCWarning(clangdLog) << client->name() << client->stateString();
     ClientCapabilities caps = Client::defaultClientCapabilities();
     Utils::optional<TextDocumentClientCapabilities> textCaps = caps.textDocument();
     if (textCaps) {