luukvbaal b8e5fd51fd fix(column): don't count signs on lines beyond eob #33410 ...

Problem:  Computed previous buffer line count may be beyond end of
          buffer. This results in signs being removed from `b_signcols`
          that were never included in it, tripping an assertion.

Solution: Store the previous line count as it was before appending or
          deleting lines. Use it to clamp the edited region when
          clearing signs before a splice, after which it is reset.
(cherry picked from commit 4a706a7092)

2025-04-11 12:28:22 +00:00

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