Every line of the edition details popup was parsed as a label and a value,
so a line carrying no colon had one appended to it. A multi-line overview
therefore rendered with a spurious colon at the end of each continuation
line, and Goodreads sourced descriptions, which use CRLF, turned their
blank lines into a lone colon.
Split each line on the first colon only, leave a line without one
unlabelled, and trim the trailing carriage return so a CRLF blank line
renders as a real paragraph break.
Building the line is now a named function so its branches can be asserted
directly. Rendered text discards the carriage return, so a snapshot alone
cannot tell the trimming apart from leaving it in place.
A continuation line that happens to contain a colon is still styled as a
label. Telling those apart needs the details to be built as styled lines
rather than flattened to text and parsed back.
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