Return true iff the textual diff between before and after disappears once every ```mermaid block is stripped from both sides. Trailing whitespace on each line is normalised so an autofix that only rewrites trailing whitespace inside narrative is still treated as drift (line count matters), but cross-platform line endings are not.
Return
trueiff the textual diff betweenbeforeandafterdisappears once every```mermaidblock is stripped from both sides. Trailing whitespace on each line is normalised so an autofix that only rewrites trailing whitespace inside narrative is still treated as drift (line count matters), but cross-platform line endings are not.