TreeGroup: scrollEventIntoView crashes with empty levels

[matsbryntse-dev]

Bug description

Calling scrollEventIntoView() on a Scheduler configured with TreeGroup feature using empty levels: [] throws:

TreeGroup.js: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'isLoading')

Steps to reproduce

1. Configure Scheduler with treeGroup: { levels: [] }
2. Call scheduler.scrollEventIntoView(event)

Root cause

TreeGroup.waitForLoad() accesses me.originalStore.isLoading without guarding for originalStore being undefined. When levels is empty, TreeGroup has not been transformed yet and originalStore is never assigned.

Expected behavior

No error. The call should work as if TreeGroup was not active.

Forum post

https://forum.bryntum.com/viewtopic.php?f=44&t=35255&p=179469#p179469

[matsbryntse-dev]

Fix PR: https://github.com/bryntum/bryntum-suite/pull/13662

One-line guard in TreeGroup.waitForLoad() — early return when originalStore is undefined (not yet transformed with empty levels).