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cmux-next: tune thread minimap contrast #21183

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d6947c9
cmux-next: tune thread minimap contrast
teamleaderleo Oct 16, 2026
74a6641
test(next): format minimap contrast assertions
teamleaderleo Oct 16, 2026
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9 changes: 6 additions & 3 deletions webviews/src/agent-session/acpmux/threadMinimap/threadMinimap.css
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Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,9 @@
top: 4px;
left: 0;
background: currentColor;
opacity: 0.4;
/* The reference rail is about 25/255 darker than the first pass. Keep the tick quiet so the
transcript remains primary while hover/focus can still reach full text contrast. */
opacity: 0.28;
transform-origin: 0 50%;
/* Hovering in: the spring (the first line is the fallback for an engine without linear()). */
transition: transform 160ms cubic-bezier(0.25, 1, 0.5, 1);
Expand Down Expand Up @@ -117,13 +119,14 @@
color: var(--acpmux-minimap-text);
}
.acpmux-minimap__tick[data-tone="current"] .acpmux-minimap__bar {
opacity: 0.6;
/* Match the same measured contrast correction for prompts currently in view. */
opacity: 0.48;
}
.acpmux-minimap__rail[data-hovering] .acpmux-minimap__tick[data-tone="current"] {
color: var(--acpmux-minimap-rest);
}
.acpmux-minimap__rail[data-hovering] .acpmux-minimap__tick[data-tone="current"] .acpmux-minimap__bar {
opacity: 0.4;
opacity: 0.28;
}
/* The hovered, scrubbed or focused row: the text, at once (no color transition). */
.acpmux-minimap__tick[data-tone="active"] {
Expand Down
15 changes: 15 additions & 0 deletions webviews/test/thread-minimap-contrast.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
import { expect, test } from "bun:test";
import { readFileSync } from "node:fs";
import { join } from "node:path";

const css = readFileSync(join(import.meta.dir, "../src/agent-session/acpmux/threadMinimap/threadMinimap.css"), "utf8");

test("thread minimap keeps rest and current ticks at the measured reference contrast", () => {
expect(css).toMatch(/\.acpmux-minimap__bar,\s*\.acpmux-minimap__dot\s*\{[\s\S]*?opacity: 0\.28;/);
expect(css).toMatch(
/\.acpmux-minimap__tick\[data-tone="current"\] \.acpmux-minimap__bar\s*\{[\s\S]*?opacity: 0\.48;/,
);
expect(css).toMatch(
/\.acpmux-minimap__rail\[data-hovering\] \.acpmux-minimap__tick\[data-tone="current"\] \.acpmux-minimap__bar\s*\{[\s\S]*?opacity: 0\.28;/,
);
});
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