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fix: stop treating the child combinator as a prelude boundary when pruning

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removeSelectorAt walked backward to find the rule prelude and stopped at
any '>', added so the walk would not escape past the <style> open tag.
That same character is the CSS child combinator, so pruning one unused
selector from a list like '.wrap > .orphan, .orphan' cut the prelude
mid-list; when every remaining fragment equaled the flagged selector, the
whole-rule branch then deleted from the cut point and left a dangling
'.wrap >' in source. A '>' now bounds the walk only when it actually
closes a <style ...> tag; combinators are walked through.

Regression tests cover a mid-list combinator prune and the dangling-
fragment shape (verified failing on the previous code).

AI-assisted (Claude Code).

Co-Authored-By: Claude Code <noreply@anthropic.com>
This commit is contained in:
Paul Bakaus
2026-07-28 18:05:41 -07:00
co-authored by Claude Code
parent 20213a6817
commit 0c18cbc9ef
2 changed files with 38 additions and 2 deletions
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skill/scripts/live/accept-css.mjs
+11 -2
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@@ -535,11 +535,20 @@ function removeSelectorAt(source, start, end) {
if (braceIdx === -1) return { changed: false, selector, source };
const bodyEnd = scanBlockEnd(source, braceIdx + 1);
// Prelude spans backward from the brace to the previous } ; { or style open.
// Prelude spans backward from the brace to the previous } ; { or the end
// of the <style> open tag. A bare `>` is NOT a boundary: it is the child
// combinator, and cutting there truncates a selector list like
// `.a > .b, .c` mid-prelude. Only a `>` that closes a `<style ...>` tag
// bounds the walk.
let preludeStart = start;
for (let i = start - 1; i >= 0; i--) {
const ch = source[i];
if (ch === '}' || ch === '{' || ch === ';' || ch === '>') { preludeStart = i + 1; break; }
if (ch === '}' || ch === '{' || ch === ';') { preludeStart = i + 1; break; }
if (ch === '>') {
const styleOpen = source.lastIndexOf('<style', i);
if (styleOpen !== -1 && source.indexOf('>', styleOpen) === i) { preludeStart = i + 1; break; }
continue; // child combinator inside the prelude
}
if (i === 0) preludeStart = 0;
}
const prelude = source.slice(preludeStart, braceIdx);