[Grid] Multi-Column header misalignment when resizing

[mbechev]

Description

Having locked and grouped columns causes flickering and misalignment issues when resizing. The issue is reproduced only when using locked feature. With sticky option there are no issues.

Steps To Reproduce

1. Increase the width of a group column.
2. Notice the flickering behavior and the misalignment.
   https://stackblitz.com/edit/angular-qkzrsw?file=src%2Fapp%2Fapp.component.ts

Screenshots or video

Screen.Recording.2024-10-29.at.12.01.40.mov

Actual Behavior

Columns are misaligned when resized.

Expected Behavior

The resizing experience should be smooth, without any flickering or misalignments.