LanguageClient: do not auto-assign documents to all clients

Only assign documents to a client if the client was started by a
setting. Programatically started clients should handle assigned
documents manually.

Change-Id: I192c4c011a48e0406f267d3cab3c860f740ddad7
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/languageclient/languageclientsettings.cpp

@@ -566,6 +566,7 @@ Client *BaseSettings::createClient()
     client->setName(Utils::globalMacroExpander()->expand(m_name));
     client->setSupportedLanguage(m_languageFilter);
     client->setInitializationOptions(initializationOptions());
+    client->setActivateDocumentAutomatically(true);
     return client;
 }