nested progress bars...

[Robert Collins]

so do we have consensus on the following?

 * ui_factory.progress_bar is deprecated but continues to operate as it
does now giving a 'replace the current pb' progress bar to the client,
which does not stack and does not need to be returned to the ui factory.
 * ui_factory.get_progress_bar() will produce a nested progress bar
   which must be returned to the factory via pb.finished()

Nesting can be done by uis any way it wants: replacing the current pb,
having a spinner, having a two-level bar, having horizontal splits: the
client won't know.

alternatively we can do:
 * ui_factory.progress_bar stays as is
 * ui_factory.nested_progress_bar returns a nested bar which needs to be
returned via pb.finished(). This will not nest under a 'progress_bar()'
returned progress bar, only under another nested_progress_bar.

Rob


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