Clang: Don't send multiple completions for the same position

If we send already a completion we should test if there is already one
sent for the same position.

Change-Id: Ie88f89bff0e1da1c5e747827a45154c7ccaecabc
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/plugins/clangcodemodel/clangbackendipcintegration.cpp

@@ -137,6 +137,11 @@ void IpcReceiver::deleteProcessorsOfEditorWidget(TextEditor::TextEditorWidget *t
     }
 }
 
+bool IpcReceiver::isExpectingCodeCompletedMessage() const
+{
+    return !m_assistProcessorsTable.isEmpty();
+}
+
 void IpcReceiver::alive()
 {
     qCDebug(log) << "<<< AliveMessage";
@@ -446,6 +451,11 @@ void IpcCommunicator::updateTranslationUnitVisiblity()
     updateTranslationUnitVisiblity(currentCppEditorDocumentFilePath(), visibleCppEditorDocumentsFilePaths());
 }
 
+bool IpcCommunicator::isNotWaitingForCompletion() const
+{
+    return !m_ipcReceiver.isExpectingCodeCompletedMessage();
+}
+
 void IpcCommunicator::updateTranslationUnitVisiblity(const Utf8String &currentEditorFilePath,
                                                      const Utf8StringVector &visibleEditorsFilePaths)
 {