CMake: Cancel running tasks on crash of cmake server

Change-Id: I5bf36a5ebb9d6a80278b9b83a14788a171f9c14f
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/cmakeprojectmanager/servermodereader.cpp

@@ -103,7 +103,10 @@ void ServerModeReader::setParameters(const BuildDirReader::Parameters &p)
         connect(m_cmakeServer.get(), &ServerMode::connected,
                 this, &ServerModeReader::isReadyNow, Qt::QueuedConnection); // Delay
         connect(m_cmakeServer.get(), &ServerMode::disconnected,
-                this, [this]() { m_cmakeServer.reset(); }, Qt::QueuedConnection); // Delay
+                this, [this]() {
+            stop();
+            m_cmakeServer.reset();
+        }, Qt::QueuedConnection); // Delay
     }
 }