LanguageClient: fix restart check for stdio clients

Change-Id: I4acb61b48b7ac18423b2e106f1f9ea9b3f7ccb70
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/languageclient/client.cpp

@@ -775,6 +775,11 @@ const DynamicCapabilities &Client::dynamicCapabilities() const
     return m_dynamicCapabilities;
 }
 
+const BaseClientInterface *Client::clientInterface() const
+{
+    return m_clientInterface.data();
+}
+
 void Client::log(const ShowMessageParams &message,
                      Core::MessageManager::PrintToOutputPaneFlag flag)
 {

src/plugins/languageclient/client.h

@@ -147,6 +147,7 @@ public:
 
     const LanguageServerProtocol::ServerCapabilities &capabilities() const;
     const DynamicCapabilities &dynamicCapabilities() const;
+    const BaseClientInterface *clientInterface() const;
 
 signals:
     void initialized(LanguageServerProtocol::ServerCapabilities capabilities);

src/plugins/languageclient/languageclientinterface.cpp

@@ -110,7 +110,7 @@ StdIOClientInterface::~StdIOClientInterface()
     Utils::SynchronousProcess::stopProcess(m_process);
 }
 
-bool StdIOClientInterface::needsRestart(const StdIOSettings *settings)
+bool StdIOClientInterface::needsRestart(const StdIOSettings *settings) const
 {
     return m_executable != settings->m_executable || m_arguments != settings->m_arguments;
 }

src/plugins/languageclient/languageclientinterface.h

@@ -74,7 +74,7 @@ public:
     StdIOClientInterface &operator=(const StdIOClientInterface &) = delete;
     StdIOClientInterface &operator=(StdIOClientInterface &&) = delete;
 
-    bool needsRestart(const StdIOSettings *settings);
+    bool needsRestart(const StdIOSettings *settings) const;
 
     bool start() override;
 

src/plugins/languageclient/languageclientsettings.cpp

@@ -473,7 +473,9 @@ bool StdIOSettings::needsRestart() const
 {
     if (BaseSettings::needsRestart())
         return true;
-    if (auto stdIOInterface = qobject_cast<StdIOClientInterface *>(m_client))
+    if (m_client.isNull())
+        return false;
+    if (auto stdIOInterface = qobject_cast<const StdIOClientInterface *>(m_client->clientInterface()))
         return stdIOInterface->needsRestart(this);
     return false;
 }