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, 12 insertions, 11 deletions

diff --git a/test/snapshots/edit.golden b/test/snapshots/edit.golden
index 63388124..a250850f 100644
--- a/test/snapshots/edit.golden
+++ b/test/snapshots/edit.golden
@@ -1,14 +1,14 @@
 == snap inserted grid=100x31 cursor=16,10
 |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/edit/cwd Tty+bash Save Mode Fi   /tmp/pardes-snap/edit/cwd Tty+bash Save Mode Fi
+|   /tmp/pardes-snap/edit/cwd Tty+bash Save Mode F    /tmp/pardes-snap/edit/cwd Tty+bash Save Mode F
+|   ilter Collapse Del                                ilter Collapse Del
 |  ls                                                ls
 |  e.txt                                             e.txt
 |
 |
 |
 |
-|
 |    hello-insert
 |
 |
@@ -16,17 +16,18 @@
 |
 |
 |
-|   /tmp/pardes-snap/edit/cwd Tty+bash Save Mode Fi
+|   /tmp/pardes-snap/edit/cwd Tty+bash Save Mode F
+|   ilter Collapse Del
 |  ls
 |  e.txt
 == style inserted grid=100x31
 |0: 0-70 #b2c3b8,#1d2824, 71-99 d,#1d2824,
 |1: 0-1 #ffffff,#887455, 2-2 d,#26362d, 3-34 #becfc4,#26362d, 35-49 d,#26362d, 50-51 #ffffff,#887455, 52-52 d,#1d2824, 53-84 #b2c3b8,#1d2824, 85-99 d,#1d2824,
-|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-28 #becfc4,#26362d, 29-36 #dfbce5,#26362d, 37-49 #becfc4,#26362d, 50-51 #ffffff,#496656, 52-52 d,#1d2824, 53-78 #b2c3b8,#1d2824, 79-86 #d3b0d9,#1d2824, 87-99 #b2c3b8,#1d2824,
-|3: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-28 #becfc4,#26362d, 29-36 #dfbce5,#26362d, 37-48 #becfc4,#26362d, 49-49 d,#26362d, 50-51 #ffffff,#496656, 52-52 d,#1d2824, 53-78 #b2c3b8,#1d2824, 79-86 #d3b0d9,#1d2824, 87-98 #b2c3b8,#1d2824, 99-99 d,#1d2824,
+|3: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-20 #becfc4,#26362d, 21-49 d,#26362d, 50-51 #ffffff,#496656, 52-52 d,#1d2824, 53-70 #b2c3b8,#1d2824, 71-99 d,#1d2824,
 |4: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
-|5: 0-0 d,#608269, 1-49 d,#0d1410, 50-50 d,#608269, 51-99 d,#0d1410,
-|6: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|5: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|6: 0-0 d,#608269, 1-49 d,#0d1410, 50-50 d,#608269, 51-99 d,#0d1410,
 |7: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |8: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |9: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
@@ -37,11 +38,11 @@
 |14: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |15: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |16: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
-|17: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-28 #b2c3b8,#1d2824, 29-36 #d3b0d9,#1d2824, 37-49 #b2c3b8,#1d2824, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
-|18: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|17: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-28 #b2c3b8,#1d2824, 29-36 #d3b0d9,#1d2824, 37-48 #b2c3b8,#1d2824, 49-49 d,#1d2824, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|18: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-20 #b2c3b8,#1d2824, 21-49 d,#1d2824, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |19: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
-|20: 0-0 d,#608269, 1-49 d,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
-|21: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|20: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
+|21: 0-0 d,#608269, 1-49 d,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |22: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |23: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,
 |24: 0-0 d,#608269, 1-1 d,#0d1410, 2-49 #e5eee5,#0d1410, 50-50 d,#608269, 51-51 d,#0d1410, 52-99 #e5eee5,#0d1410,