FormatWriter: share shifted columns between lines #3923
Merged
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Current assumption is that stops in each line of an align block match positionally, that is, first stop of every line matches the first new shifted column, etc.
However, later on we will break this assumption, by adding intermediate (nested) stops in some lines.
Therefore, each stop will need to contain reference to its own shifted column, via a wrapped-integer object.
Helps with #3465.