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, 36 insertions, 31 deletions

diff --git a/test/snapshots/ttylook.golden b/test/snapshots/ttylook.golden
index 6bfe5470..e58dd488 100644
--- a/test/snapshots/ttylook.golden
+++ b/test/snapshots/ttylook.golden
@@ -1,7 +1,8 @@
-== snap tok1 grid=120x31 cursor=2,4
+== snap tok1 grid=120x31 cursor=2,5
 |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/ttylook/cwd Tty+bash Save Mode Filter Co   /tmp/pardes-snap/ttylook/cwd Tty+bash Save Mode Filter Co
+|   /tmp/pardes-snap/ttylook/cwd Tty+bash Save Mode Filter C    /tmp/pardes-snap/ttylook/cwd Tty+bash Save Mode Filter C
+|   ollapse Del                                                 ollapse Del
 |  ls                                                          ls
 |  big.txt  plain.txt  sub                                     big.txt  plain.txt  sub
 |
@@ -15,18 +16,18 @@
 |
 |
 |
-|
-|   /tmp/pardes-snap/ttylook/cwd Tty+bash Save Mode Filter Co
+|   /tmp/pardes-snap/ttylook/cwd Tty+bash Save Mode Filter C
+|   ollapse Del
 |  ls
 |  big.txt  plain.txt  sub
 == style tok1 grid=120x31
 |0: 0-70 #b2c3b8,#1d2824, 71-119 d,#1d2824,
 |1: 0-1 #ffffff,#887455, 2-2 d,#26362d, 3-34 #becfc4,#26362d, 35-59 d,#26362d, 60-61 #ffffff,#887455, 62-62 d,#1d2824, 63-94 #b2c3b8,#1d2824, 95-119 d,#1d2824,
-|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-31 #becfc4,#26362d, 32-39 #dfbce5,#26362d, 40-59 #becfc4,#26362d, 60-61 #ffffff,#496656, 62-62 d,#1d2824, 63-91 #b2c3b8,#1d2824, 92-99 #d3b0d9,#1d2824, 100-119 #b2c3b8,#1d2824,
-|3: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|4: 0-0 d,#608269, 1-1 d,#0d1410, 2-8 #f5f7ee,#3c614a, 9-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|5: 0-0 d,#608269, 1-59 d,#0d1410, 60-60 d,#608269, 61-119 d,#0d1410,
-|6: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-31 #becfc4,#26362d, 32-39 #dfbce5,#26362d, 40-58 #becfc4,#26362d, 59-59 d,#26362d, 60-61 #ffffff,#496656, 62-62 d,#1d2824, 63-91 #b2c3b8,#1d2824, 92-99 #d3b0d9,#1d2824, 100-118 #b2c3b8,#1d2824, 119-119 d,#1d2824,
+|3: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-13 #becfc4,#26362d, 14-59 d,#26362d, 60-61 #ffffff,#496656, 62-62 d,#1d2824, 63-73 #b2c3b8,#1d2824, 74-119 d,#1d2824,
+|4: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|5: 0-0 d,#608269, 1-1 d,#0d1410, 2-8 #f5f7ee,#3c614a, 9-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|6: 0-0 d,#608269, 1-59 d,#0d1410, 60-60 d,#608269, 61-119 d,#0d1410,
 |7: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |8: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |9: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
@@ -37,11 +38,11 @@
 |14: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |15: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |16: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|17: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-31 #b2c3b8,#1d2824, 32-39 #d3b0d9,#1d2824, 40-59 #b2c3b8,#1d2824, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|18: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|17: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-31 #b2c3b8,#1d2824, 32-39 #d3b0d9,#1d2824, 40-58 #b2c3b8,#1d2824, 59-59 d,#1d2824, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|18: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-13 #b2c3b8,#1d2824, 14-59 d,#1d2824, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |19: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|20: 0-0 d,#608269, 1-59 d,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-|21: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|20: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
+|21: 0-0 d,#608269, 1-59 d,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |22: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |23: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |24: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
@@ -51,22 +52,26 @@
 |28: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |29: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
 |30: 0-0 d,#608269, 1-1 d,#0d1410, 2-59 #e5eee5,#0d1410, 60-60 d,#608269, 61-61 d,#0d1410, 62-119 #e5eee5,#0d1410,
-== snap tok2 grid=120x31 cursor=11,4
-== snap tokback grid=120x31 cursor=2,4
-== snap insert grid=120x31 cursor=4,4
-|4:   nnbig.txt  plain.txt  sub                                   big.txt  plain.txt  sub
-== snap tok3 grid=120x31 cursor=22,4
-|4:   big.txt  plain.txt  sub                                     big.txt  plain.txt  sub
-== snap diropen grid=120x31 cursor=4,8
-|6:    /tmp/pardes-snap/ttylook/cwd/sub Tty+bash Save Mode Filte
-|7:   ls
+== snap tok2 grid=120x31 cursor=11,5
+== snap tokback grid=120x31 cursor=2,5
+== snap insert grid=120x31 cursor=4,5
+|5:   nnbig.txt  plain.txt  sub                                   big.txt  plain.txt  sub
+== snap tok3 grid=120x31 cursor=22,5
+|5:   big.txt  plain.txt  sub                                     big.txt  plain.txt  sub
+== snap diropen grid=120x31 cursor=4,9
+|4:   big.txt  plain.txt  sub                                     ls
+|5:                                                               big.txt  plain.txt  sub
+|6:    /tmp/pardes-snap/ttylook/cwd/sub Tty+bash Save Mode Filt
+|7:    er Collapse Del
+|8:   ls
 == snap noop grid=120x31 cursor=2,4
-== snap fileopen grid=120x31 cursor=7,10
-|9:    /tmp/pardes-snap/ttylook/cwd/big.txt Save Tty Collapse De
-|10:      1 line 1
-|11:      2 line 2
-|12:      3 line 3
-|13:      4 line 4
-|14:      5 line 5
-|15:      6 line 6
-|16:      7 line 7
+== snap fileopen grid=120x31 cursor=7,11
+|8:
+|9:    /tmp/pardes-snap/ttylook/cwd/big.txt Save Tty Collapse D
+|10:    el
+|11:      1 line 1
+|12:      2 line 2
+|13:      3 line 3
+|14:      4 line 4
+|15:      5 line 5
+|16:      6 line 6