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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.

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test-churn.out
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% create test repository
adding a
adding b
adding c
% churn separate directories
user1 1 ***************************************************************
% churn all
user3 3 ***************************************************************
user1 3 ***************************************************************
user2 2 ******************************************
% churn up to rev 2
user2 2 ***************************************************************
user1 1 ********************************
% churn with aliases
alias3 3 **************************************************************
alias1 3 **************************************************************
user2 2 *****************************************
% churn with .hgchurn
alias3 3 **************************************************************
alias1 3 **************************************************************
user2 2 *****************************************
% churn with column specifier
user3 3 ***********************
user1 3 ***********************
user2 2 ***************
% churn by hour
06 1 *****************
09 2 *********************************
12 4 ******************************************************************
13 1 *****************
% churn with separated added/removed lines
user1 +3/-1 +++++++++++++++++++++++++++++++++++++++++--------------
user3 +3/-0 +++++++++++++++++++++++++++++++++++++++++
user2 +2/-0 +++++++++++++++++++++++++++
% changeset number churn
user1 4 ***************************************************************
user3 3 ***********************************************
user2 2 ********************************
adding foo
test 0