Visual glitch on closing cell (when having cells fewer than screen height)

[antonc27]

Hello,

First of all, I want to say thanks for this awesome lib!

But I'm having some visual glitches when collapsing cells if total height of cells is less than screen size (e.g. having just one cell):

I was able also to reproduce this bug in demo project:

1. Change DemoTableViewController to return 1 instead of 100 tableView(_: UITableView, numberOfRowsInSection _: Int) method
2. Launch app, select single cell
3. When clicking on <, cell collapse with a visual glitch

Any idea of how this can be fixed?

Thank you in advance,
Anton