Advanced component view: mainTemplate does not scroll in sync with sideTemplate

[KeyTurns]

Description
When using the “advanced” API ( with separate sideTemplate and mainTemplate), only the side panel scrolls vertically. The main timeline area remains fixed, so bars and dates fall out of alignment with their group labels.

Steps to Reproduce

Import and render in advanced mode:

<ngx-gantt-root [sideWidth]="300">
  <ng-template #sideTemplate>
    <!-- group labels -->
  </ng-template>
  <ng-template #mainTemplate>
    <!-- gantt bars -->
  </ng-template>
</ngx-gantt-root>

Populate sideTemplate with enough groups that a vertical scrollbar appears.

Scroll down in the viewport.

Actual Behavior

The sideTemplate content scrolls, but the mainTemplate remains stuck at the top.

Bars and group labels no longer line up once you scroll.

Expected Behavior
Both templates should scroll in lock-step: the timeline (mainTemplate) and the group list (sideTemplate) should stay aligned vertically.

Reproduction Repository
http://gantt.ngnice.com/components/advanced

[KeyTurns]

@walkerkay thanks for working on this, I really appreciate that. We are currently using this in production and i'm getting a lot of feedback regarding this exact issue. Do you have any estimate when you think it will be posted to the main repo?