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331bbc41f8
Using a `tree:0` filter instead of `blob:none` reduces the checkout time
from over 3 minutes to about 45 seconds. The required trees/blobs will
then be fetched on-demand.
This on-demand fetching creates additional output for `git range-diff`
on stderr, so we hide that. This only happens the first time it's run,
so we don't need to adjust the other calls - which will still return any
real errors, should they happen.
(cherry picked from commit e575364ae6)