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ui: option to preserve the progress bar

Authored by joerg.sonnenberger.

Description

ui: option to preserve the progress bar

Some interface like the fast-import format of git are meant for pipe
processing. It can be still desirable to have progress bars in this
case, but clearing the bar after each output operation is not desirable.

Differential Revision: https://phab.mercurial-scm.org/D6843

Details