A right click on a diff line opens the place it names: its file, the hunk's new line, the line itself

In a diff pane (a .diff/.patch file, or a command pane's diff output), the
look's own expansion, which its hover shows, takes a whole line for a
`diff --git`, `---`, `+++` or `@@` line wherever the pointer is on it,
markers included, and for a hunk line when the pointer is on its `+`, `-`
or space. Then the look opens the file (a/ b/ dropped, timestamps cut) at
the line from the hunk header and the lines above it: `@@` the hunk's
first new line, context and added lines their own, a removed line the new
line now where it was. `diff --git` and `+++` open the new file; `---` the
old one, unless the `+++` under it names another. On a hunk line's code
the expansion is its words, the prefix never one of them, and looks as
ever. Other panes are untouched.

Paths resolve in the repository (walking up to `.git` or `.jj` from the
diff's directory, or a command pane's), then that directory. A file not
here opens nothing and says `Look: b/x: no such file here`, or `deleted by
this diff`. A 9P look writing a whole line of the diff does the same.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 9fe6a1fb..04854a37 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -4361,6 +4361,10 @@ 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).