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]>

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