Utils: Make AspectContainer a QObject

... and add a 'void applied()' signal.

I actually wanted to avoid that, but it seems to be a recurring
pattern of usage to do something on top of plain apply for all
children, like triggering IVersionControl::configurationChanged
in the VCS plugins.

Change-Id: Ib64c3147c6ba30b178237e51a3a377a291c550f2
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/utils/aspects.cpp

@@ -2089,8 +2089,8 @@ public:
 
 } // Internal
 
-AspectContainer::AspectContainer()
-    : d(new Internal::AspectContainerPrivate)
+AspectContainer::AspectContainer(QObject *parent)
+    : QObject(parent), d(new Internal::AspectContainerPrivate)
 {}
 
 /*!
@@ -2192,6 +2192,8 @@ void AspectContainer::apply()
 {
     for (BaseAspect *aspect : qAsConst(d->m_items))
         aspect->apply();
+
+    emit applied();
 }
 
 void AspectContainer::cancel()

src/libs/utils/aspects.h

@@ -483,10 +483,12 @@ private:
     std::unique_ptr<Internal::TextDisplayPrivate> d;
 };
 
-class QTCREATOR_UTILS_EXPORT AspectContainer
+class QTCREATOR_UTILS_EXPORT AspectContainer : public QObject
 {
+    Q_OBJECT
+
 public:
-    AspectContainer();
+    AspectContainer(QObject *parent = nullptr);
     ~AspectContainer();
 
     AspectContainer(const AspectContainer &) = delete;
@@ -547,6 +549,9 @@ public:
     const_iterator begin() const;
     const_iterator end() const;
 
+signals:
+    void applied();
+
 private:
     std::unique_ptr<Internal::AspectContainerPrivate> d;
 };

src/plugins/docker/dockersettings.h

@@ -33,7 +33,7 @@
 namespace Docker {
 namespace Internal {
 
-class DockerSettings : public QObject, public Utils::AspectContainer
+class DockerSettings : public Utils::AspectContainer
 {
 public:
     DockerSettings();

src/plugins/qmakeprojectmanager/qmakesettings.h

@@ -32,7 +32,7 @@
 namespace QmakeProjectManager {
 namespace Internal {
 
-class QmakeSettings : public QObject, public Utils::AspectContainer
+class QmakeSettings : public Utils::AspectContainer
 {
     Q_OBJECT