CodeAssist: reset flag before starting new processor

If a new processor is started while waiting for a result of a still
running procesor reset the flag whether content was received while
waiting.

Change-Id: I21a254681050d1db077deec88706f0010670e0ac
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/texteditor/codeassist/codeassistant.cpp

@@ -441,6 +441,7 @@ void CodeAssistantPrivate::invalidateCurrentRequestData()
     m_asyncProcessor = nullptr;
     m_requestRunner = nullptr;
     m_requestProvider = nullptr;
+    m_receivedContentWhileWaiting = false;
 }
 
 CompletionAssistProvider *CodeAssistantPrivate::identifyActivationSequence()