C++: emit signal when project parts have been updated.

To be used in the ClangCodeModel, because there is no other way to find
out if the ProjectParts got changed.

Change-Id: Ie5681b4997adb9103499cf2864c81970cbd2be55
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cpptools/ModelManagerInterface.h

@@ -239,6 +239,11 @@ Q_SIGNALS:
     void sourceFilesRefreshed(const QStringList &files);
     void extraDiagnosticsUpdated(QString fileName);
 
+    /// \brief Emitted after updateProjectInfo method is called on the model-manager.
+    ///
+    /// Other classes can use this to get notified when the \c ProjectExplorer has updated the parts.
+    void projectPartsUpdated(ProjectExplorer::Project *project);
+
 public Q_SLOTS:
     virtual void updateModifiedSourceFiles() = 0;
     virtual QFuture<void> updateSourceFiles(const QStringList &sourceFiles) = 0;

src/plugins/cpptools/cppmodelmanager.cpp

@@ -966,6 +966,8 @@ void CppModelManager::updateProjectInfo(const ProjectInfo &pinfo)
 
     if (!qgetenv("QTCREATOR_DUMP_PROJECT_INFO").isEmpty())
         dumpModelManagerConfiguration();
+
+    emit projectPartsUpdated(pinfo.project().data());
 }
 
 QList<CppModelManager::ProjectPart::Ptr> CppModelManager::projectPart(const QString &fileName) const