When a PR description already ends with git trailers (e.g. Issue: X,
Signed-off-by:), the co-author separator line (---------) was still
inserted before the Co-authored-by lines, breaking the trailer block.
messageHasTrailers now skips the separator so co-authors are appended
directly into the existing trailer block.
In PR-description mode (PopulateSquashCommentWithCommitMessages=false),
commit messages beyond the oldest were silently dropped. They are now
appended as bullet points after the PR description, consistent with the
commit-message mode format.
The commit-message loop is extracted into formatSquashMergeCommitMessages.
Callers that want to skip the oldest commit pass a trimmed slice
(commits[:max(0, len(commits)-1)]) instead of a skipFirst bool flag.
Co-Authored-By: Nicolas <nicolas@bircks.eu>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
f5d0e1633d