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Husam
578312200a
The placeholder-restore pass in mdToHtml put code, math, mermaid and allowed-HTML blocks back with a string replacement, so String.replace read `$&`, `` $` ``, `$'` and `$$` in the *replacement* as substitution patterns. A fenced block containing them rendered corrupted: `$&` re-inserted the placeholder (`perl -pe 's/world/$& again/'` became `s/world/___CODE_BLOCK_0___amp; again/`), `` $` `` and `$'` spliced in the surrounding document, and `$$` collapsed to a single `$`. Pass a function replacer at all four sites, matching the inline-code site below them, which was already fixed this way. A function's return value is inserted verbatim with no `$` interpretation. The inline-code comment claimed `echo $1` would be read as a back-reference; with a string search value there are no capture groups, so `$1` is already literal. Reworded to name the four sequences that do corrupt. Fixes #5663