feat: abstract out scavenger scopes

src/cpp/scavenge.hpp

@@ -2,6 +2,8 @@
 
 #include <qobject.h>
 #include <qqmlcomponent.h>
+#include <qqmlintegration.h>
+#include <qqmllist.h>
 #include <qqmlparserstatus.h>
 #include <qtmetamacros.h>
 
@@ -30,7 +32,7 @@ protected:
 
 class Scavengeable {
 public:
-	Scavengeable() = default;
+	explicit Scavengeable() = default;
 	virtual ~Scavengeable() = default;
 
 	Scavengeable(Scavengeable&) = delete;
@@ -47,3 +49,31 @@ QObject* createComponentScavengeable(
     QQmlComponent& component,
     QVariantMap& initialProperties
 );
+
+///! Reloader connection scope
+/// Attempts to maintain scavengeable connections.
+/// This is mostly useful to split a scavengeable component slot (e.g. `Variants`)
+/// into multiple slots.
+///
+/// If you don't know what that means you probably don't need it.
+class ScavengeableScope: public Scavenger, virtual public Scavengeable {
+	Q_OBJECT;
+	Q_PROPERTY(QQmlListProperty<QObject> data READ data);
+	Q_CLASSINFO("DefaultProperty", "data");
+	QML_ELEMENT;
+
+public:
+	explicit ScavengeableScope(QObject* parent = nullptr): Scavenger(parent) {}
+
+	void earlyInit(QObject* old) override;
+	QObject* scavengeTargetFor(QObject* child) override;
+
+	QQmlListProperty<QObject> data();
+
+private:
+	static void appendComponent(QQmlListProperty<QObject>* list, QObject* component);
+
+	// track only the children assigned to `data` in order
+	QList<QObject*> mData;
+	QList<QObject*> scavengeableData;
+};