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, 26 insertions, 7 deletions

diff --git a/src/themes/acme.zig b/src/themes/acme.zig
index d91e626b..17ef4224 100644
--- a/src/themes/acme.zig
+++ b/src/themes/acme.zig
@@ -6,20 +6,28 @@
 //! in) is a mid grey, and 15 (bright white) is BLACK, because a program asking
 //! for the brightest color on a light page means "make this stand out".
 //!
-//! The selection is acme's own: plan9's DDarkyellow #eeee9e, the colour acme
-//! sweeps text with, and black ink over it — acme changes the paper under a
-//! selection and never the letters. Out of the same draw.h palette the
-//! scrollbar's #99994c (DYellowgreen) is already taken from.
+//! Every colour below that acme has is acme's own, from plan9port's acme.c
+//! iconinit and draw.h: the tag #eaffff and body #ffffea (each 25% of
+//! DPalebluegreen or DPaleyellow over white), their selections #9eeeee and
+//! #eeee9e with black ink (acme changes the paper under a selection, never
+//! the letters), the exec and look sweeps #aa0000 and #006600 with white ink,
+//! the scrollbar's #99994c track under a #ffffea thumb, 12px wide, the
+//! #8888cc (DPurpleblue) line between a tag and its body and the column
+//! button, and 2px black rules between columns, windows and tags.
+//!
+//! acme has no focus colour; pardes needs one, so the focused pane's button
+//! is filled #8888cc (the column button's look) and every other pane's is
+//! acme's own: #eaffff in a 2px #8888cc ring, #000099 inside it when dirty.
 pub const theme = .{
     .name = "acme",
     .bg = .{ 0xff, 0xff, 0xea },
     .fg = .{ 0x00, 0x00, 0x00 },
-    .sel_bg = .{ 0xfa, 0xfa, 0x92 },
+    .sel_bg = .{ 0xee, 0xee, 0x9e },
     .sel_fg = .{ 0x00, 0x00, 0x00 },
     .tag_bg = .{ 0xea, 0xff, 0xff },
     .tag_fg = .{ 0x00, 0x00, 0x00 },
-    .box = .{ 0x66, 0x3f, 0xe0 },
-    .box_dim = .{ 0x35, 0x3a, 0x58 },
+    .box = .{ 0x88, 0x88, 0xcc },
+    .box_dim = .{ 0xea, 0xff, 0xff },
     .kw = .{ 0x97, 0x0d, 0xae },
     .str = .{ 0x00, 0x77, 0x33 },
     .num = .{ 0xa0, 0x52, 0x00 },
@@ -27,6 +35,17 @@ pub const theme = .{
     .lineno = .{ 0x99, 0x99, 0x80 },
     .scroll_track = .{ 0x99, 0x99, 0x4c },
     .scroll_thumb = .{ 0xff, 0xff, 0xea },
+    .border = .{ 0x00, 0x00, 0x00 },
+    .tag_rule = .{ 0x88, 0x88, 0xcc },
+    .rule_px = 2,
+    .box_border = .{ 0x88, 0x88, 0xcc },
+    .box_dirty = .{ 0x00, 0x00, 0x99 },
+    .rail_px = 12,
+    .tag_sel_bg = .{ 0x9e, 0xee, 0xee },
+    .sweep_bg = .{ .{ 0xee, 0xee, 0x9e }, .{ 0xaa, 0x00, 0x00 }, .{ 0x00, 0x66, 0x00 } },
+    .sweep_fg = .{ .{ 0x00, 0x00, 0x00 }, .{ 0xff, 0xff, 0xff }, .{ 0xff, 0xff, 0xff } },
+    .column_box = .{ 0x88, 0x88, 0xcc },
+    .column_box_dim = .{ 0x88, 0x88, 0xcc },
     .palette = .{
         .{ 0x00, 0x00, 0x00 }, .{ 0xaa, 0x22, 0x22 }, .{ 0x22, 0x80, 0x22 }, .{ 0x88, 0x66, 0x00 },
         .{ 0x22, 0x44, 0xbb }, .{ 0x99, 0x33, 0x99 }, .{ 0x11, 0x88, 0x88 }, .{ 0x55, 0x55, 0x55 },