A diff line looks up the path and line it names, as any look does

The look on a diff line was its own resolver: a walk up to .git/.jj from
the diff's directory, its own "no such file here" and "deleted by this
diff". A review tool's cached patch, in no repository, missed every file
though the session's terminals sat in the checkout.

Now a diff line only expands and transforms. Its expansion (what the hover
shows) is the whole line for a header, a `@@` line, or a hunk line
pointed at on its prefix, and its text is the look address the line names
(look.diffAddress): `path` for `diff --git`/`---`/`+++`, `path:c` for
`@@ -a,b +c,d @@`, `path:N` for a hunk line's new line (a removed line's,
the new line now where it was). That text goes through the regular look
exactly as if selected by hand: same resolution, placement and errors. A
9P look of a whole diff line takes the same transform.

Kept: the line classification, hunk arithmetic, git prefix stripping and
timestamp cutting (diff.zig). Gone: the repo-root walk, its messages,
Target.old_side and deletesAhead, and the click's row stash
(Pardes.diff_look). A test compares a B3 on a cached patch's line with a
look of the hand-selected `entry/src/entry.rs:2` in the same session.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 0 insertions, 4 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index fbc19b8a..f479f44d 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -4376,10 +4376,6 @@ pub const Pardes = struct {
     chord_hold: bool = false,
     /// The look just run found nothing (look.zig missed).
     look_missed: bool = false,
-    /// The diff line a right click just expanded to, by row: a look at its
-    /// text goes to the place that row names, not the first equal line
-    /// (look.zig diffLook).
-    diff_look: ?struct { serial: u32, row: usize } = null,
     look_hover_wait: ?look.LookHoverWait = null,
     /// The place a look-hover last found nothing to open: the pointer
     /// resting there does not ask again every frame (look.noteLookHover).