Fix incorrectly calculated height on collapes rows

[antman3351]

Hey Oli,

as mentioned in the issue #3654 ( So i'm going to copy and paste a bit 😜 )

I noticed in the VirtualDomVertical module in _removeTopRow the row height is always the same even though the rows are not the same height.

I think the issue is the column height isn't recalculated after the rows are collapsed, so I've added a call to calcHeight() after the rows are collapsed.

Cheers,
Antonio

[olifolkerd]

Hey @antman3351

Thanks for the PR, it definitly should recalc row height after the collapse event, so thanks for that, but this wont fix the issue outlined in #3654 which is a wider issue to do with how the vdom handles adjustment of variable height rows in its calculations.

I will merge this in as it should certainly be included

Cheers

Oli :)