When loading the files of a commit we passed --no-renames, so a rename
showed up as a separate delete and add rather than a single R entry.
That made it impossible to work with a rename that also modifies the
file: the modifications were spread across a full deletion and a full
addition instead of appearing as the handful of lines that actually
changed. The staging view already shows renames and lets you stage
their hunks, so there was no good reason for the patch builder to
differ; the flag was only there because the commit-file parser couldn't
cope with the rename record format.
Switch the commit-file loader and the per-file diff to --find-renames,
teach the parser about the rename record (a status followed by two
paths), and carry the previous path through the patch builder so the
diff for a rename is loaded with both paths, which is what makes git
emit the rename in the first place.
A whole-file selection keeps the rename in the header, so the rename
moves or is discarded together with the file's contents. A partial
selection instead strips the rename metadata and points the header at
the new path, so applying the patch only changes the contents and
leaves the rename in place; the blob index line is kept so that a 3-way
apply can still fall back to a blob merge.
Discarding a renamed file from a commit now discards both the new and
the old path, so the new file is removed and the old one is restored.
Changing the rename similarity threshold refreshes the commit files
panel too, not just the files panel, so that a rename can turn into a
delete and add or back. It is disabled while building a patch, however,
because the patch builder caches each file's diff by path and would
desync if a rename changed into a delete and add underneath it.
Finally, copying a file's diff from the commit files panel now passes
both paths for a rename, so the copied diff shows the rename instead of
a new-file add.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Actually, we simply enable them in any panel, even those that can never show a
diff. Since the commands show a toast, that's enough feedback to understand what
happened; the change will take effect the next time you switch to a panel that
does show diffs.
Same for ( and ) to change the rename threshold.
Refresh is one of those functions that shouldn't require error handling (similar
to triggering a redraw of the UI, see
https://github.com/jesseduffield/lazygit/issues/3887).
As far as I see, the only reason why Refresh can currently return an error is
that the Then function returns one. The actual refresh errors, e.g. from the git
calls that are made to fetch data, are already logged and swallowed. Most of the
Then functions do only UI stuff such as selecting a list item, and always return
nil; there's only one that can return an error (updating the rebase todo file in
LocalCommitsController.startInteractiveRebaseWithEdit); it's not a critical
error if this fails, it is only used for setting rebase todo items to "edit"
when you start an interactive rebase by pressing 'e' on a range selection of
commits. We simply log this error instead of returning it.
