Design notes: delta wrapped-row metadata bug now fixed

The same pager-level wrapping gap found in difftastic (§10.8) was fixed in delta
too. Delta only wraps in side-by-side mode, so the bug was SxS-only; each wrapped
continuation row now re-emits the record of the primary line it continues,
without advancing delta's line-number counters (so subsequent lines keep correct
numbers). Update §9.3, §10.8, and the §17.1 correction note accordingly.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

diff-line-metadata-notes.md

@@ -507,12 +507,12 @@ emits V1 when the advertised list contains `V1`.
 - **Wrapped continuation rows** (`Hunk*Wrapped`) get no attachment in the prototype
   — only the primary content row does. Fine for the normal case (gocui's own
   wrapping is handled host-side by the view-line→buffer-line mapping); delta-level
-  wrapping of one logical line into several rows is the unhandled case. **This is
-  now confirmed a real bug** (via the difftastic prototype, §10.8): when the *pager*
+  wrapping of one logical line into several rows is the unhandled case. **This was
+  confirmed a real bug** (via the difftastic prototype, §10.8): when the *pager*
   wraps, each row is a distinct host buffer line and needs its own record, so `e`/
-  `enter`/hunk-nav break on continuation rows. difftastic was fixed to tag every
-  wrapped row; **delta needs the same fix** (`wrap-max-lines`) when its patch is
-  revisited.
+  `enter`/hunk-nav break on continuation rows. **Now FIXED in delta too** (§10.8):
+  delta wraps only in side-by-side mode, and each wrapped row now re-emits its
+  primary line's record (no counter advance). difftastic was fixed the same way.
 - **Header rows** (`@@`, `diff --git`, `---`/`+++`) get no attachment; acting on a
   header row falls through to #1, then to no-selection.
 
@@ -774,7 +774,14 @@ record at the start of **every output row** it produces for that line, including
 its own wrapped continuations.* The host attaches per buffer line, so it just
 works; pagers that rely on terminal wrapping emit one row and are unaffected.
 
-**Delta has the same latent bug** (§9.3 noted wrapped rows get no attachment "in
-the prototype"; with `wrap-max-lines` delta emits multiple rows too). Not yet
-fixed there — when the delta patch is revisited, apply the same change: emit the
-record on every wrapped output row, not just the first.
+**Delta had the same bug — now FIXED** (§9.3). Delta wraps **only in side-by-side
+mode** (`wrap_minusplus_block`/`wrap_zero_block` are called nowhere else; unified
+mode truncates instead), so the bug was SxS-only, but it was real there. The fix
+is the same idea adapted to delta's counter-based emitter: a wrapped continuation
+row (`HunkZeroWrapped`/`HunkMinusWrapped`/`HunkPlusWrapped`) **re-emits the record
+of the primary line it continues, without advancing the counters** — so the next
+line's numbers stay correct (verified: a context line after a 5-row wrapped line
+still reports the right new-line). `osc_for_line` is the single chokepoint, so the
+one change covers both SxS emit paths (the minus/plus precompute and the
+`paint_zero_lines_side_by_side` context path). Landed as an `amend!` into the
+delta side-by-side commit, with a unit test (`test_wrapped_rows_reemit_…`).

focused-main-view-notes.md

@@ -1549,10 +1549,12 @@ rows carry **no** OSC. So a changed line — a paired minus/plus on one visual r
 
 > **Correction (after the difftastic prototype, see diff-line-metadata-notes.md §10.8):**
 > "wrapped continuation rows carry no OSC" is a **bug**, not a feature, whenever the
-> *pager* does the wrapping (delta with `wrap-max-lines`, difftastic side-by-side):
+> *pager* does the wrapping (delta in side-by-side mode, difftastic side-by-side):
 > each wrapped row is a distinct host buffer line, so `e`/`enter`/hunk-nav break on
 > the un-tagged continuations. The fix — emit the line's record on **every** wrapped
-> output row — was applied to difftastic; **delta still needs it** here.
+> output row — was applied to **both** difftastic and delta (delta re-emits the
+> primary's record without advancing its line-number counters). See
+> diff-line-metadata-notes.md §10.8.
 
 ### 17.2 The verdict: v1 needs NO addition for side-by-side