A pane tag wraps onto rows and can collapse to one, as acme's does

acme's frame wraps a tag at its right edge and the window grows to show
every row (wind.c wintaglines); Tagup/Tagdown shrink it to one row and back.
Pane tags used to be one row, scrolled sideways to the caret. Now a tag's
lines wrap at its width (one cell kept for the caret past a full row) and it
starts expanded; insert-mode Up on the first row collapses it, Down on the
last row expands it, and Alt-Up/Alt-Down do so in either mode. A word the
wrap breaks across rows is still one word to a click and a selection.
Column and workspace tags keep scrolling sideways.

Tests read body rows relative to the body's first row; the 41 snapshot
goldens that moved were re-recorded by name after a programmatic check that
each differs only by body rows shifting under the taller tags, and twelve
scripts whose clicks targeted fixed rows now click the same text.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/test/snapshots/respawn.snap b/test/snapshots/respawn.snap
index eac74267..e0ebea13 100644
--- a/test/snapshots/respawn.snap
+++ b/test/snapshots/respawn.snap
@@ -6,8 +6,8 @@ wait 8000 Newcol Joincol
 stable 700 20000
 # middle-click Del on the lower-left pane's tag: the pane id is freed while
 # its shell process stays alive in the slot
-press middle @Del 18
-release middle @Del 18
+press middle @Collapse+9 18
+release middle @Collapse+9 18
 stable 700 10000
 # Alt-n reuses the freed id -> spawn effect lands on the occupied slot
 key a-n