The _foreground_background_guidance() function matched background-wrapper
keywords (nohup/disown/setsid) anywhere in the command text, including
inside quoted strings, Python -c code, commit messages, and PR body text.
Two-layer fix:
1. Strip single-quoted, double-quoted, and backtick-quoted content before
pattern matching via _strip_quotes() helper.
2. Tighten the regex to only match keywords at command-start positions
(after ^, ;, &, &&, ||, or $() — not mid-argument.
Both layers are needed: quote stripping handles the common case of keywords
in string literals, and the position-aware regex handles unquoted cases
like 'export FOO=setsid' (word boundary match, wrong position).
Fixes#20064
wesleysimplicio
364ddd45e8