Changelog entry files were listed in reverse alphabetical order of the
file name, by happenstance. Now, changelog entry files are listed in
the order in which the changes were merged. More precisely: look for
the git commit where the entry file was created, and look where this
commit was merged into the current branch. List older merges first.
List never-merged commits in date order after all the merged ones.
List never-committed files in file timestamp order after all the
committed ones.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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