Diagnosing Vim Undofile Issues When Undo History Does Not Persist
Step‑by‑step diagnostic guide for when Vim’s undofile fails to save or restore undo history across sessions.
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vimArchitecture of Vim's Persistent Undo (undofile) Feature
Explains how Vim’s undofile feature persists undo history across sessions, covering requirements, minimal design, trust boundaries, checks, failures, and when the design would need to change.
undofile persistence boundary with writebackup on read-only buffers
Persistent undo via 'undofile' and 'undodir' is a documented Vim feature for retaining undo history across sessions independent of swap-based crash recovery. The documented boundary between undo persistence and file write semantics is relevant when a buffer is read-only and 'writebackup' is configured. The interaction of 'undofile' with write access checks,
Undo file format version 3 in Vim 9.0 blocks cross-version undofile sharing
Goal Ensure that a repeatable development environment can persist undo history across different Vim versions used by team members. Constraint Vim 9.0 writes undo files using format version 3, which Vim 8.2 and earlier cannot read, leading to silent loss of undo history when the same undofile is accessed with an older binary. Uncertainty It is unclear whether