svn.previousCommitsUser is too slow and has no restricted limit

[cm7cd]

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The svn.previousCommitsUser command is too slow whenever we commit a message. Also, we can restrict the number of previous commits to display on commit that could improve the performance.

[JohnstonCode]

It seems that a limit is only applied if you are not using the previousCommitsUser configuration option. It would be nice to also limit the log by user functionality.