Steve Howell 3aef11dc0e list_render: Extract get_list_scrolling_container(). ...

We put this in `scroll_util` to make it more likely
we will eventually unify this with other scrolling
logic.  (A big piece to move is ui.get_scroll_element,
but that's for another PR.)

And then the other tactical advantage is that we get
100% line coverage on it.

I changed the warning to an error, since I don't
think we ever expect scrolling at the `body` level,
and I don't bother with the preview node.

2020-04-15 15:13:26 -07:00

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