Before this PR fix, in the case the Footer has a scrollbar and you move it, then the Header and Body containers scrollbars aren't moved / synced with the Footer scrollbar.
The opposite is working fine, i.e. you scroll Header, Body containers firstly and the Footer scrollbar is synced / moving correctly.
This PR syncs both Header and Body containers, when you start scrolling the Footer firstly.
Before this PR fix, in the case the Footer has a scrollbar and you move it, then the Header and Body containers scrollbars aren't moved / synced with the Footer scrollbar.
The opposite is working fine, i.e. you scroll Header, Body containers firstly and the Footer scrollbar is synced / moving correctly.
This PR syncs both Header and Body containers, when you start scrolling the Footer firstly.
Here's how it works: