Clang: Rebuild overview model tree when token data is updated

In release builds overview model tree is built earlier
then the job with token information is completed.

Change-Id: I1a563551e813996001fb97924ac441e2b7d599b9
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp

@@ -267,6 +267,7 @@ void ClangEditorDocumentProcessor::updateTokenInfos(
     if (documentRevision != revision())
         return;
     m_tokenInfos = tokenInfos;
+    emit tokenInfosUpdated();
 }
 
 static int currentLine(const TextEditor::AssistInterface &assistInterface)

src/plugins/clangcodemodel/clangeditordocumentprocessor.h

@@ -106,6 +106,9 @@ public:
 public:
     static ClangEditorDocumentProcessor *get(const QString &filePath);
 
+signals:
+    void tokenInfosUpdated();
+
 private:
     void onParserFinished();
     void updateProjectPartAndTranslationUnitForEditor();

src/plugins/clangcodemodel/clangoverviewmodel.cpp

@@ -206,7 +206,19 @@ bool OverviewModel::rebuild(const QString &filePath)
     ClangEditorDocumentProcessor *processor = ClangEditorDocumentProcessor::get(filePath);
     if (!processor)
         return false;
-    m_filePath = filePath;
+    if (m_filePath != filePath) {
+        if (!m_filePath.isEmpty()) {
+            ClangEditorDocumentProcessor *previousProcessor
+                    = ClangEditorDocumentProcessor::get(m_filePath);
+            if (previousProcessor) {
+                disconnect(previousProcessor, &ClangEditorDocumentProcessor::tokenInfosUpdated,
+                           this, &OverviewModel::needsUpdate);
+            }
+        }
+        m_filePath = filePath;
+        connect(processor, &ClangEditorDocumentProcessor::tokenInfosUpdated, this,
+                &OverviewModel::needsUpdate);
+    }
 
     const TokenContainers &tokenContainers = processor->tokenInfos();
     auto *root = new TokenTreeItem;