progress bars on bzr+http push behave badly

[Robert Collins]

I've noticed some progress bars go from 0 to 50 in one step, that is
some minutes long. This occurs because the first update is throttled,
and the next action is a readv on http which blocks for the whole read.

One way would be to not throttle progress bars with small totals.

Another is fixing http readv in some regard.

-Rob

 affects bzr
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[Vincent Ladeuil (vila)]

http readv (at least for urllib) has been fixed (see bug #173010)

[Vincent Ladeuil (vila)]

marked as ui-related and confirmed so that it gets evaluated again for recent versions