Summary:
Each view type currently responsible for fitting appropriately within the box
it's given (e.g. deciding which container is scrollable). CustomView wasn't
doing a good job of it, particularly when showing "columns aren't mapped"
message.
Test Plan:
Only CSS affected. Checked manually on FF, Chrome, Safari that CustomViews take
the right amount of space, and scroll well, in 3 situations: not-mapped,
not-configured, and a functional widget.
Reviewers: jarek
Reviewed By: jarek
Subscribers: jarek
Differential Revision: https://phab.getgrist.com/D4316
fbc0418118