Simple column-transformation example
Store column transformations on columns
Array-wrap if we were given a single transformation
Merge column_layout handling into columns

No point having two things for the same basic concept, and
column_layout is already causing confusion.
Raise explicit error if we have no window
Catch exceptions via Future->call
Fix multi-column rendering
Add note about scrollbar extents
Support removal of adapter
Extract splice handler and make it more useful
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