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Fixes: #380
I've tested the following matrix of west updates:
{descendant branch checked out + dirty tree,
detached head + dirty tree,
branch checked out + clean tree,
detached descendant HEAD + clean tree}
x
{default behavior,
--keep-descendants,
--rebase}
And the output always warns when something surprising happens. The win is mostly due to removing the --quiet from the 'git checkout --detach' and letting git do the work for us.
I want to backport these changes to 0.7.2, so I'm intentionally preserving the existing --keep-descendants behavior. We can defer changes to that to 0.8.0 pending resolution of #381.