Re: [tycho-user] jgit timestamp provider ignores local changes

I would not use different qualifier strings based on state of working
copy. Qualifiers are compared as strings, I can't recall if longer
string is considered newer or older and I am sure many users will not
know this either.With dirty working tree there isn't really a good
durable timestamp to compare builds with, so we just need to educate
users to be aware of local repository pollution with transient builds.

Also, it would be interesting to have the tycho-p2-plugin able to
compare a bundle with a baseline ignoring the qualifier.
That would allow to just not care about the qualifier, and if everything
else is the same (classes, MANIFEST...) we replace the new one with the
previous one.
For this, the use-case is not "Reproducible Versions Qualifier" but
"Avoid providing always new builds of the same thing".

This approach was considered but rejected. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=367581#c9