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)
 {

src/plugins/clangcodemodel/clangbackendipcintegration.h

@@ -76,6 +76,8 @@ public:
     void deleteAndClearWaitingAssistProcessors();
     void deleteProcessorsOfEditorWidget(TextEditor::TextEditorWidget *textEditorWidget);
 
+    bool isExpectingCodeCompletedMessage() const;
+
 private:
     void alive() override;
     void echo(const ClangBackEnd::EchoMessage &message) override;
@@ -152,6 +154,8 @@ public:
     void registerFallbackProjectPart();
     void updateTranslationUnitVisiblity();
 
+    bool isNotWaitingForCompletion() const;
+
 public: // for tests
     IpcSenderInterface *setIpcSender(IpcSenderInterface *ipcSender);
     void killBackendProcess();

src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp

@@ -342,13 +342,16 @@ IAssistProposal *ClangCompletionAssistProcessor::startCompletionHelper()
     case ClangCompletionContextAnalyzer::PassThroughToLibClang: {
         m_addSnippets = m_completionOperator == T_EOF_SYMBOL;
         m_sentRequestType = NormalCompletion;
-        sendCompletionRequest(analyzer.positionForClang(), modifiedFileContent);
+        const bool requestSent = sendCompletionRequest(analyzer.positionForClang(),
+                                                       modifiedFileContent);
+        setPerformWasApplicable(requestSent);
         break;
     }
     case ClangCompletionContextAnalyzer::PassThroughToLibClangAfterLeftParen: {
         m_sentRequestType = FunctionHintCompletion;
         m_functionName = analyzer.functionName();
-        sendCompletionRequest(analyzer.positionForClang(), QByteArray());
+        const bool requestSent = sendCompletionRequest(analyzer.positionForClang(), QByteArray());
+        setPerformWasApplicable(requestSent);
         break;
     }
     default:
@@ -702,15 +705,34 @@ bool shouldSendDocumentForCompletion(const QString &filePath,
     return true;
 }
 
-void setLastCompletionPositionAndDocumentRevision(const QString &filePath,
-                                                  int completionPosition)
+bool shouldSendCodeCompletion(const QString &filePath,
+                              int completionPosition)
 {
     auto *document = cppDocument(filePath);
 
     if (document) {
-        document->sendTracker().setLastCompletionPosition(completionPosition);
-        document->sendTracker().setLastSentRevision(document->revision());
+        auto &sendTracker = document->sendTracker();
+        return sendTracker.shouldSendCompletion(completionPosition);
     }
+
+    return true;
+}
+
+void setLastDocumentRevision(const QString &filePath)
+{
+    auto *document = cppDocument(filePath);
+
+    if (document)
+        document->sendTracker().setLastSentRevision(int(document->revision()));
+}
+
+void setLastCompletionPosition(const QString &filePath,
+                               int completionPosition)
+{
+    auto *document = cppDocument(filePath);
+
+    if (document)
+        document->sendTracker().setLastCompletionPosition(completionPosition);
 }
 
 QString projectPartIdForEditorDocument(const QString &filePath)
@@ -726,7 +748,7 @@ QString projectPartIdForEditorDocument(const QString &filePath)
 }
 }
 
-void ClangCompletionAssistProcessor::sendCompletionRequest(int position,
+bool ClangCompletionAssistProcessor::sendCompletionRequest(int position,
                                                            const QByteArray &customFileContent)
 {
     int line, column;
@@ -735,17 +757,22 @@ void ClangCompletionAssistProcessor::sendCompletionRequest(int position,
 
     const QString filePath = m_interface->fileName();
 
-    if (shouldSendDocumentForCompletion(filePath, position)) {
-        sendFileContent(customFileContent);
-        setLastCompletionPositionAndDocumentRevision(filePath, position);
+    auto &ipcCommunicator = m_interface->ipcCommunicator();
+
+    if (shouldSendCodeCompletion(filePath, position)
+            || ipcCommunicator.isNotWaitingForCompletion()) {
+        if (shouldSendDocumentForCompletion(filePath, position)) {
+            sendFileContent(customFileContent);
+            setLastDocumentRevision(filePath);
+        }
+
+        const QString projectPartId = projectPartIdForEditorDocument(filePath);
+        ipcCommunicator.completeCode(this, filePath, uint(line), uint(column), projectPartId);
+        setLastCompletionPosition(filePath, position);
+        return true;
     }
 
-    const QString projectPartId = projectPartIdForEditorDocument(filePath);
-    m_interface->ipcCommunicator().completeCode(this,
-                                                filePath,
-                                                uint(line),
-                                                uint(column),
-                                                projectPartId);
+    return false;
 }
 
 TextEditor::IAssistProposal *ClangCompletionAssistProcessor::createProposal() const

src/plugins/clangcodemodel/clangcompletionassistprocessor.h

@@ -84,7 +84,7 @@ private:
     UnsavedFileContentInfo unsavedFileContent(const QByteArray &customFileContent) const;
 
     void sendFileContent(const QByteArray &customFileContent);
-    void sendCompletionRequest(int position, const QByteArray &customFileContent);
+    bool sendCompletionRequest(int position, const QByteArray &customFileContent);
 
     void handleAvailableCompletions(const CodeCompletions &completions);
     bool handleAvailableFunctionHintCompletions(const CodeCompletions &completions);

src/plugins/texteditor/codeassist/codeassistant.cpp

@@ -263,14 +263,8 @@ void CodeAssistantPrivate::requestProposal(AssistReason reason,
     case IAssistProvider::Asynchronous: {
         processor->setAsyncCompletionAvailableHandler(
             [this, processor, reason](IAssistProposal *newProposal){
-                if (m_asyncProcessor != processor) {
-                    delete newProposal->model();
-                    delete newProposal;
-                    return;
-                }
-
-                invalidateCurrentRequestData();
                 QTC_CHECK(newProposal);
+                invalidateCurrentRequestData();
                 displayProposal(newProposal, reason);
 
                 emit q->finished();
@@ -282,10 +276,10 @@ void CodeAssistantPrivate::requestProposal(AssistReason reason,
             delete processor;
         } else if (!processor->performWasApplicable()) {
             delete processor;
+        } else { // ...async request was triggered
+            m_asyncProcessor = processor;
         }
 
-        // ...otherwise the async request was triggered
-        m_asyncProcessor = processor;
         break;
     }
     } // switch