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e973eb4a8f
Problem:
Undo "u" is wrong after cascading an insert that adds a line (`A{<CR>`, `o`, …).
The cascade replays the insert as a per-cursor `edit()`, where `u_save`
stores a line multiple times into the undo block at different line
counts; then `getbot` computes conflicting entries that undo each other.
Solution:
`u_save` the whole affected line-range as one entry at session start,
the same approach used by Vim for linewise ops (`op_shift`, `ex_sort`).
The "enclosing" `u_save` wins and the invalid entries are overridden.