io/fileview: write values into correct JsonObjects in deserialize

Property writes were being done on the JsonAdapter and not the child
JsonObject, resulting in the data of children being set on the
adapter's props, and occasional crashes.

changelog/next.md

@@ -66,6 +66,7 @@ set shell id.
 - Worked around Qt bug causing crashes when plugging and unplugging monitors.
 - Fixed HyprlandFocusGrab crashing if windows were destroyed after being passed to it.
 - Fixed ScreencopyView pixelation when scaled.
+- Fixed JsonAdapter crashing and providing bad data on read when using JsonObject.
 
 ## Packaging Changes
 

src/io/jsonadapter.cpp

@@ -155,13 +155,13 @@ void JsonAdapter::deserializeRec(const QJsonObject& json, QObject* obj, const QM
 
 			if (prop.metaType() == QMetaType::fromType<QVariant>()) {
 				auto variant = jval.toVariant();
-				auto oldValue = prop.read(this).value<QJSValue>();
+				auto oldValue = prop.read(obj).value<QJSValue>();
 
 				// Calling prop.write with a new QJSValue will cause a property update
 				// even if content is identical.
 				if (jval.toVariant() != oldValue.toVariant()) {
 					auto jsValue = qmlEngine(this)->fromVariant<QJSValue>(jval.toVariant());
-					prop.write(this, QVariant::fromValue(jsValue));
+					prop.write(obj, QVariant::fromValue(jsValue));
 				}
 			} else if (QMetaType::canView(prop.metaType(), QMetaType::fromType<JsonObject*>())) {
 				// FIXME: This doesn't support creating descendants of JsonObject, as QMetaType.metaObject()
@@ -196,7 +196,7 @@ void JsonAdapter::deserializeRec(const QJsonObject& json, QObject* obj, const QM
 			               QMetaType::fromType<QQmlListProperty<JsonObject>>()
 			           ))
 			{
-				auto pval = prop.read(this);
+				auto pval = prop.read(obj);
 
 				if (pval.canConvert<QQmlListProperty<JsonObject>>()) {
 					auto lp = pval.value<QQmlListProperty<JsonObject>>();