core/reloader: fix Quickshell.reload not working

Has been broken since engine generations were introduced.

src/core/generation.hpp

@@ -12,6 +12,8 @@
 #include "shell.hpp"
 #include "singleton.hpp"
 
+class RootWrapper;
+
 class EngineGeneration: public QObject {
 	Q_OBJECT;
 
@@ -28,6 +30,7 @@ public:
 
 	static EngineGeneration* findObjectGeneration(QObject* object);
 
+	RootWrapper* wrapper = nullptr;
 	QmlScanner scanner;
 	QsUrlInterceptor urlInterceptor;
 	QsInterceptNetworkAccessManagerFactory interceptNetFactory;

src/core/qmlglobal.cpp

@@ -17,6 +17,7 @@
 #include <qvariant.h>
 #include <unistd.h>
 
+#include "generation.hpp"
 #include "qmlscreen.hpp"
 #include "rootwrapper.hpp"
 
@@ -144,8 +145,8 @@ QQmlListProperty<QuickshellScreenInfo> QuickshellGlobal::screens() {
 }
 
 void QuickshellGlobal::reload(bool hard) {
-	auto* rootobj = QQmlEngine::contextForObject(this)->engine()->parent();
-	auto* root = qobject_cast<RootWrapper*>(rootobj);
+	auto* generation = EngineGeneration::findObjectGeneration(this);
+	auto* root = generation == nullptr ? nullptr : generation->wrapper;
 
 	if (root == nullptr) {
 		qWarning() << "cannot find RootWrapper for reload, ignoring request";

src/core/rootwrapper.cpp

@@ -46,6 +46,7 @@ void RootWrapper::reloadGraph(bool hard) {
 	scanner.scanQmlFile(this->rootPath);
 
 	auto* generation = new EngineGeneration(std::move(scanner));
+	generation->wrapper = this;
 
 	// todo: move into EngineGeneration
 	if (this->generation != nullptr) {