why does subversion make me update, only to get no changes?

Sometimes when I try to commit, subversion tells me that I have to update
first. When I do the update, nothing changes in my local filesystem (no
modified or added files appear), and then the commit succeeds.

Why?

This happens so often, that the subversion client should just
automatically do the update when the first commit fails and then only
fail to the user when a commit after the update also fails.

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