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Increasing or decreasing the diff context size (the `{`/`}` keybindings)
re-renders the diff with a different `git diff -U<n>` command. Because the
command key changes, the render reset the main view to the top — losing the
spot the user was reading, which is exactly the spot the context change is
about.
Preserve it instead, reusing the identity-based restore built for the escape
path. This is its sibling consumer: capture the lines around the anchor (the
selection, or the top visible line when there's none) as restore candidates,
and after the re-render land on the nearest one that survived, put back at the
same screen row. Prefer the anchor line itself, falling back outward only when
it didn't survive: a context line vanishes when the context size shrinks,
whereas additions and deletions always survive, so expansion stops at the
first change line in each direction and the candidate list always contains a
survivor. Landing on the nearest survivor keeps scrolling to a minimum, and a
context line that is still in the patch stays put (or stays selected).
This generalizes the shared restore helper to take a prioritized candidate
list (the escape path passes a single candidate). It covers the focused main
view and every side panel's diff, since they all render into the same "main"
view through the same path. A showing selection is re-established on the landed
line; otherwise the view stays in scroll mode.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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