Make progress dialog show up more reliably

Counterintuitively, setting the minimum duration to 200ms actually makes
the dialog show up while waiting for the first progress signal. I had
thought that setting it to 0 would make it show up right away, but with a
value of 0 it waits for the first progress notification and with slow
internet connections that can take quite a while (and with some git
operations no progress notification will be sent out the whole time).

So this should make the situation with the progress bar a little better.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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