nested progress bars...

[Aaron Bentley]

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Robert Collins wrote:
| Well, I think that generally any long operation should start a progress
| bar, and that the global ui factory lets clients determine how they want
| the user feedback to be delivered.

There is still something a little odd about requesting the API to do a
tree transform and having it decide to write to your console as well.
But I agree that what you propose would be an improvement, and I'm in
favor of it.  Maybe I'm just neurotic.

Aaron
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