TreeList: white space appears in locked column section when the component height changes dynamically

[yanmariomenev]

Description

When the TreeList has a dynamic height (e.g., configured to fill available viewport height), resizing the browser window causes a white space to appear in the locked column section. The issue appears to be related to the column height synchronization between the locked columns and the main TreeList body not updating correctly when the component dimensions change.

The Grid component is not affected by this bug, which can also be tested in the example below.

Steps To Reproduce

https://stackblitz.com/edit/angular-gbjhwyzf-tniyblna

1. Create a TreeList with at least one locked column.
2. Configure the TreeList to use a dynamic height (e.g., height: 100% or bound to the viewport).
3. Resize the browser window (increase or decrease the height).
4. Observe the locked column section.

Screenshots or video

Screen.Recording.2026-03-24.at.10.51.25.mov

Workaround

https://stackblitz.com/edit/angular-xeug5aks-fqpgxndb?file=src%2Fapp%2Fapp.component.ts