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Commit 05077896 authored by Brodie Rao's avatar Brodie Rao
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pager: don't run pager if nothing is written to stdout/stderr

This decides when to run the pager based on the first call to
ui.write() and ui.write_err(). This has the side effect of not the
output of subprocesses that write output before hg does.
parent 04f6de46
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