core/reloader: trigger postReload with a signal

A signal is now used over the previous tree-searching method as some
QML components such as Repeater fail to reparent created children to
themselves, which breaks the tree.

src/core/generation.cpp

@@ -161,8 +161,9 @@ void EngineGeneration::postReload() {
 	if (this->engine == nullptr || this->root == nullptr) return;
 
 	QsEnginePlugin::runOnReload();
-	PostReloadHook::postReloadTree(this->root);
-	this->singletonRegistry.onPostReload();
+
+	emit this->firePostReload();
+	QObject::disconnect(this, &EngineGeneration::firePostReload, nullptr, nullptr);
 }
 
 void EngineGeneration::setWatchingFiles(bool watching) {

src/core/generation.hpp

@@ -75,6 +75,7 @@ public:
 signals:
 	void filesChanged();
 	void reloadFinished();
+	void firePostReload();
 
 public slots:
 	void quit();

src/core/reload.cpp

@@ -129,14 +129,18 @@ QObject* Reloadable::getChildByReloadId(QObject* parent, const QString& reloadId
 void PostReloadHook::componentComplete() {
 	auto* engineGeneration = EngineGeneration::findObjectGeneration(this);
 	if (!engineGeneration || engineGeneration->reloadComplete) this->postReload();
+	else {
+		// disconnected by EngineGeneration::postReload
+		QObject::connect(
+		    engineGeneration,
+		    &EngineGeneration::firePostReload,
+		    this,
+		    &PostReloadHook::postReload
+		);
+	}
 }
 
 void PostReloadHook::postReload() {
 	this->isPostReload = true;
 	this->onPostReload();
 }
-
-void PostReloadHook::postReloadTree(QObject* root) {
-	for (auto* child: root->children()) PostReloadHook::postReloadTree(child);
-	if (auto* self = dynamic_cast<PostReloadHook*>(root)) self->postReload();
-}

src/core/reload.hpp

@@ -131,10 +131,10 @@ public:
 	void classBegin() override {}
 	void componentComplete() override;
 
-	void postReload();
 	virtual void onPostReload() = 0;
 
-	static void postReloadTree(QObject* root);
+public slots:
+	void postReload();
 
 protected:
 	bool isPostReload = false;

src/core/singleton.cpp

@@ -51,9 +51,3 @@ void SingletonRegistry::onReload(SingletonRegistry* old) {
 		singleton->reload(old == nullptr ? nullptr : old->registry.value(url));
 	}
 }
-
-void SingletonRegistry::onPostReload() {
-	for (auto* singleton: this->registry.values()) {
-		PostReloadHook::postReloadTree(singleton);
-	}
-}

src/core/singleton.hpp

@@ -26,7 +26,6 @@ public:
 
 	void registerSingleton(const QUrl& url, Singleton* singleton);
 	void onReload(SingletonRegistry* old);
-	void onPostReload();
 
 private:
 	QHash<QUrl, Singleton*> registry;