in lib/src/highlighter.dart [610:628]
static SourceSpanWithContext _normalizeEndOfLine(SourceSpanWithContext span) {
if (span.end.column != 0) return span;
if (span.end.line == span.start.line) return span;
final text = span.text.substring(0, span.text.length - 1);
return SourceSpanWithContext(
span.start,
SourceLocation(span.end.offset - 1,
sourceUrl: span.sourceUrl,
line: span.end.line - 1,
column: text.length - text.lastIndexOf('\n') - 1),
text,
// If the context also ends with a newline, it's possible that we don't
// have the full context for that line, so we shouldn't print it at all.
span.context.endsWith('\n')
? span.context.substring(0, span.context.length - 1)
: span.context);
}