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Commit aaa046919043 authored by Gregory Szorc's avatar Gregory Szorc
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ui: flush before prompting for input with readline

I was using `hg absorb` with Python 3 and noticed that the
prompt was appearing without any output about what would be
done. After I answered the prompt, the output was printed
to stdout.

This appears to be a buffering difference between Python 2
and Python 3.

To work around it, this commit adds an explicit flush() before
calling the raw input function when readline is used.
parent b27cf9f52194
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