moonbitlang / core / 6058

91%

push

github

fix(diff): stop emitting zero-length Equal edits from group(context=0)

When group(context=0) split an interior equal run, it pushed a
context-sized Equal trailer into the closing hunk and seeded the next
hunk with a context-sized Equal leader; with context=0 both edits had
len=0, violating the documented "edits never have zero length"
invariant of Edit as exposed through Hunk::edits(). Rendered output was
unaffected, but structured consumers of the edit script could observe
the empty edits.

Skip both context edits when context is 0, and add a deterministic
regression test covering a two-cluster diff grouped without context.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

4 of 4 new or added lines in 1 file covered. (100.0%)

15998 of 17645 relevant lines covered (90.67%)

149887.92 hits per line