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, 19 insertions, 13 deletions

diff --git a/test/snapshots/shrinktag.golden b/test/snapshots/shrinktag.golden
index 8ed65105..70d36c6a 100644
--- a/test/snapshots/shrinktag.golden
+++ b/test/snapshots/shrinktag.golden
@@ -1,12 +1,12 @@
 == snap before grid=100x31 cursor=2,9
 |Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Exit
 |   New Tty Find Grep Joincol Delcol                  New Tty Find Grep Joincol Delcol
-|   /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo   /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo
+|   /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M
+|   ode Filter Collapse Del                           ode Filter Collapse Del
 |  ls                                                ls
 |  w.txt                                             w.txt
 |
 |
-|
 |    echo one; echo two
 |
 |
@@ -16,29 +16,35 @@
 |
 |
 |
-|   /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo
+|   /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M
+|   ode Filter Collapse Del
 |  ls
 |  w.txt
 == snap shrunk grid=100x31 cursor=2,9
-|3:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo  ls
-|4:   ls                                                w.txt
-|5:   w.txt
+|3:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M    ode Filter Collapse Del
+|4:    ode Filter Collapse Del                          ls
+|5:   ls                                                w.txt
+|6:   w.txt
 |8:
 |17:
 |18:
 |19:
+|20:
 == snap move-preview grid=100x31 cursor=2,9
 |8:                                                   ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌▌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌
 == snap restored grid=100x31 cursor=2,9
-|3:   ls                                                ls
-|4:   w.txt                                             w.txt
-|5:
+|3:    ode Filter Collapse Del                           ode Filter Collapse Del
+|4:   ls                                                ls
+|5:   w.txt                                             w.txt
+|6:
 |8:     echo one; echo two
-|17:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo
-|18:   ls
-|19:   w.txt
+|17:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M
+|18:    ode Filter Collapse Del
+|19:   ls
+|20:   w.txt
 == snap bottom-shrunk grid=100x31 cursor=2,9
 |17:
 |18:
 |19:
-|30:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save Mo
+|20:
+|30:    /tmp/pardes-snap/shrinktag/cwd Tty+bash Save M