acme looks like acme; every theme gets acme's button, scroll column and 2px rules

acme takes plan9port's own colours (acme.c iconinit, draw.h): selections
#eeee9e in the body and #9eeeee in the tag, black ink; exec and look sweeps
#aa0000 and #006600, white ink; a #99994c scrollbar under a #ffffea thumb;
black rules; a #8888cc tag/body rule and column button.

Every theme: the grip is acme's button, its tag row's full height, in one
scroll column with the scrollbar (rail_px, 12 at a 17px tagline, scaled,
times GripWidth, a percent, default 150; same x0/x1 to the pixel):
focused clean = solid box; focused dirty = box_dirty filled to a box ring
(acme's modbutton); unfocused clean = a box_border ring round the tag's
ground; unfocused dirty = box_dirty a pixel inside that ring. The grid, which
has no ring, marks dirty with a bold * on box_dirty in the grip's second cell
and fills an unfocused grip halfway to its ring. Regions carry a dirty flag.
Column buttons are the same shape, solid. 2px rules between columns and
stacked panes (inside the tag band's slack), none at the window edge; a 1px
tag/body rule halfway between tag and page.

Theme data: tag_sel_bg, sweep_bg/fg, tag_rule, rule_px, rail_px, box_border,
box_dirty. Chrome: rule_px, tag_rule, rail_px, grip_border, grip_focus_ring;
a comptime guard on Chrome's layout forces a wire bump once v8 ships.
Structural rules are exempt from the focus-indicator rule (docs/effects.md).

Tests: acme widths; stacked rule in the slack at two tagline sizes; every
grip-column pixel is band, button, ring or rule, and the button shares the
scrollbar's x0/x1 (4 metrics x top/bottom x focus x dirty); the four grip
states distinct in every native theme with a non-colour dirty cue in the
grid; wire round-trip of the new fields.

Shared files: src/colors.zig, src/surface.zig, src/body_layer.zig,
src/tagline.zig, src/detached/wire.zig, docs/themes.md, docs/config.md,
docs/effects.md, 21 snapshot goldens (the grip cells only),
test/gui-goldens.txt.

Motion flavours differ by design, and drive notice drops and pane moves

1 files changed, 8 insertions, 8 deletions

diff --git a/test/snapshots/ninep.golden b/test/snapshots/ninep.golden
index 65fb38ec..5391a552 100644
--- a/test/snapshots/ninep.golden
+++ b/test/snapshots/ninep.golden
@@ -73,7 +73,7 @@
 |7:      5     return 7;
 @7: 0-0 d,#608269,,body 1-1 d,#0d1410,,body 2-6 #59675c,#0d1410,,body 7-19 #e5eee5,#0d1410,,body 20-89 d,#0d1410,,body
 == snap edited-with-colors-off grid=90x15 cursor=7,4
-|2:    /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
+|2:  * /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
 |3:      1 // café λ 界
 |4:      2 const greeting = "café λ 界 é";
 |5:      3
@@ -83,8 +83,8 @@
 |9:      7 }
 |10:      8
 == 9p edited-with-colors-off grid=90x15 cursor=7,4,block
-|2:    /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
-@2: 0-1 #000000,#add38a,,tagline 2-2 d,#26362d,,tagline 3-29 #becfc4,#26362d,,tagline 30-37 #dfbce5,#26362d,,tagline 38-73 #becfc4,#26362d,,tagline 74-89 d,#26362d,,tagline
+|2:  * /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
+@2: 0-0 #000000,#add38a,,tagline 1-1 #000000,#f9cb70,b,tagline 2-2 d,#26362d,,tagline 3-29 #becfc4,#26362d,,tagline 30-37 #dfbce5,#26362d,,tagline 38-73 #becfc4,#26362d,,tagline 74-89 d,#26362d,,tagline
 |3:      1 // café λ 界
 +3: 13="é" 15="λ" 17="界" 18=""
 @3: 0-0 d,#608269,,body 1-1 d,#0d1410,,body 2-6 #59675c,#0d1410,,body 7-18 #e5eee5,#0d1410,,body 19-89 d,#0d1410,,body
@@ -104,7 +104,7 @@
 |10:      8
 @10: 0-0 d,#608269,,body 1-1 d,#0d1410,,body 2-6 #59675c,#0d1410,,body 7-89 d,#0d1410,,body
 == style colors-on grid=90x15
-|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-29 #becfc4,#26362d, 30-37 #dfbce5,#26362d, 38-73 #becfc4,#26362d, 74-89 d,#26362d,
+|2: 0-0 #000000,#add38a, 1-1 #000000,#f9cb70,b 2-2 d,#26362d, 3-29 #becfc4,#26362d, 30-37 #dfbce5,#26362d, 38-73 #becfc4,#26362d, 74-89 d,#26362d,
 |3: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-17 #b9f480,#0d1410, 18-18 d,d, 19-81 d,#0d1410, 82-82 d,#1d2824, 83-88 #b2c3b8,#1d2824, 89-89 d,#1d2824,
 |4: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-23 #e5eee5,#0d1410, 24-32 #b8d88a,#0d1410, 33-33 d,d, 34-36 #b8d88a,#0d1410, 37-37 #e5eee5,#0d1410, 38-89 d,#0d1410,
 |5: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-89 d,#0d1410,
@@ -128,7 +128,7 @@
 == style resized grid=105x20
 |0: 0-70 #b2c3b8,#1d2824, 71-104 d,#1d2824,
 |1: 0-1 #ffffff,#887455, 2-2 d,#26362d, 3-34 #becfc4,#26362d, 35-104 d,#26362d,
-|2: 0-1 #000000,#add38a, 2-2 d,#26362d, 3-29 #becfc4,#26362d, 30-37 #dfbce5,#26362d, 38-73 #becfc4,#26362d, 74-104 d,#26362d,
+|2: 0-0 #000000,#add38a, 1-1 #000000,#f9cb70,b 2-2 d,#26362d, 3-29 #becfc4,#26362d, 30-37 #dfbce5,#26362d, 38-73 #becfc4,#26362d, 74-104 d,#26362d,
 |3: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-17 #b9f480,#0d1410, 18-18 d,d, 19-96 d,#0d1410, 97-97 d,#1d2824, 98-103 #b2c3b8,#1d2824, 104-104 d,#1d2824,
 |4: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #616f64,#0d1410,b 7-23 #e5eee5,#0d1410, 24-32 #b8d88a,#0d1410, 33-33 d,d, 34-36 #b8d88a,#0d1410, 37-37 #e5eee5,#0d1410, 38-104 d,#0d1410,
 |5: 0-0 d,#608269, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-104 d,#0d1410,
@@ -151,8 +151,8 @@
 @0: 0-70 #b2c3b8,#1d2824,,tagline 71-104 d,#1d2824,,tagline
 |1:    New Tty Find Grep Joincol Delcol
 @1: 0-1 #ffffff,#887455,,tagline 2-2 d,#26362d,,tagline 3-34 #becfc4,#26362d,,tagline 35-104 d,#26362d,,tagline
-|2:    /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
-@2: 0-1 #000000,#add38a,,tagline 2-2 d,#26362d,,tagline 3-29 #becfc4,#26362d,,tagline 30-37 #dfbce5,#26362d,,tagline 38-73 #becfc4,#26362d,,tagline 74-104 d,#26362d,,tagline
+|2:  * /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
+@2: 0-0 #000000,#add38a,,tagline 1-1 #000000,#f9cb70,b,tagline 2-2 d,#26362d,,tagline 3-29 #becfc4,#26362d,,tagline 30-37 #dfbce5,#26362d,,tagline 38-73 #becfc4,#26362d,,tagline 74-104 d,#26362d,,tagline
 |3:      1 // café λ 界                                                                               Colors
 +3: 13="é" 15="λ" 17="界" 18=""
 @3: 0-0 d,#608269,,body 1-1 d,#0d1410,,body 2-6 #59675c,#0d1410,,body 7-18 #b9f480,#0d1410,,body 19-96 d,#0d1410,,body 97-97 d,#1d2824,,tagline 98-103 #b2c3b8,#1d2824,,tagline 104-104 d,#1d2824,,tagline
@@ -192,7 +192,7 @@
 == snap resized grid=105x20 cursor=7,4
 |Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Exit
 |   New Tty Find Grep Joincol Delcol
-|   /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
+| * /tmp/pardes-snap/ninep/cwd/demo.zig * Save Tty Collapse Del TreeContext
 |     1 // café λ 界                                                                               Colors
 |     2 const greeting = "café λ 界 é";
 |     3