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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.
Benoit Boissinot - - Load All Authors

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test-diffstat
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#!/bin/sh
hg init repo
cd repo
i=0; while [ "$i" -lt 213 ]; do echo a >> a; i=`expr $i + 1`; done
hg add a
echo '% wide diffstat'
hg diff --stat
echo '% diffstat width'
COLUMNS=24 hg diff --config ui.interactive=true --stat
hg ci -m adda
cat >> a <<EOF
a
a
a
EOF
echo '% narrow diffstat'
hg diff --stat
hg ci -m appenda
printf '\0' > b
hg add b
echo '% binary diffstat'
hg diff --stat
echo '% binary git diffstat'
hg diff --stat --git