git svn rebase only fetches the revisions that are required to do the
rebase, which speeds the process up quite a bit. Imagine you're working
on branch "foo" and trunk is quite active. If git svn rebase would
always fetch all the new revisions for trunk as well (which you might
not need right now), that could become quite annoying.
If you want all remote branches/tags (incl. trunk) to be updated, use
git svn fetch.
Björn
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