[nostalgia/studio] Fix TileSheetEditor to switch to appropriate subsheet on undo/redo

src/nostalgia/core/studio/tilesheeteditorview.cpp

@@ -79,6 +79,11 @@ bool TileSheetEditorView::updated() const noexcept {
 	return m_updated || m_model.updated();
 }
 
+ox::Error TileSheetEditorView::markUpdated() noexcept {
+	m_updated = true;
+	return OxError(0);
+}
+
 void TileSheetEditorView::ackUpdate() noexcept {
 	m_updated = false;
 	m_model.ackUpdate();