ProjectExplorer: Introduce a central mechanism to update RC aspects

Using the usual pattern of setting a std::function, and calling it.

In the initial steps, update() is meant to be manually called in the
derived RunConfigurations, mid-term the idea is to at least cover
well-known ("Kit changed", ...) cases centrally.

Change-Id: Ic00572bb57fb45ef109bd0ddb8a9c3132d4f0f13
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -311,6 +311,11 @@ BuildSystem *RunConfiguration::activeBuildSystem() const
     return target()->buildSystem();
 }
 
+void RunConfiguration::setUpdater(const Updater &updater)
+{
+    m_updater = updater;
+}
+
 QVariantMap RunConfiguration::toMap() const
 {
     QVariantMap map = ProjectConfiguration::toMap();
@@ -336,6 +341,12 @@ CommandLine RunConfiguration::commandLine() const
     return m_commandLineGetter();
 }
 
+void RunConfiguration::update()
+{
+    QTC_ASSERT(m_updater, return);
+    m_updater();
+}
+
 BuildTargetInfo RunConfiguration::buildTargetInfo() const
 {
     BuildSystem *bs = target()->buildSystem();

src/plugins/projectexplorer/runconfiguration.h

@@ -172,6 +172,8 @@ public:
 
     QMap<Core::Id, QVariantMap> aspectData() const;
 
+    void update();
+
 signals:
     void configurationFinished();
     void enabledChanged();
@@ -183,6 +185,9 @@ protected:
     BuildConfiguration *activeBuildConfiguration() const;
     BuildSystem *activeBuildSystem() const;
 
+    using Updater = std::function<void()>;
+    void setUpdater(const Updater &updater);
+
     virtual void updateEnabledState();
     virtual void doAdditionalSetup(const RunConfigurationCreationInfo &) {}
 
@@ -194,6 +199,7 @@ private:
 
     QString m_buildKey;
     CommandLineGetter m_commandLineGetter;
+    Updater m_updater;
 };
 
 class RunConfigurationCreationInfo