"Ignore ancestry" option on reverting changes

Hi,

Since merge operation with recent versions of Subversion got very slow,
a simple reverting from Log dialog, which invokes a reverse merge,
also became painfully slow.

While searching for this issue on the web, I found that
"ignore ancestry" can be used as a workaround. As implied, it doesn't
care about svn:mergeinfo. I bet this is not a problem for reverting a
change.

Then, could you please use "ignore ancestry" on reverting changes?

Here is a comparison with the CLI and TSVN repository r18441. Both
commands are run repeatedly till the time become almost stable between
each runs.

$ svn --version -q
1.6.6-SlikSvn-tag-1.6.6_at_40358-WIN32

$ time svn merge --dry-run -r18439:18438 .
--- Reverse-merging r18439 into '.':
U src\Utils\MiscUI\ProgressDlg.cpp

real 0m39.862s
user 0m0.015s
sys 0m0.046s

$ time svn merge --dry-run -r18439:18438 --ignore-ancestry .
--- Reverse-merging r18439 into '.':
U src\Utils\MiscUI\ProgressDlg.cpp

real 0m9.005s
user 0m0.015s
sys 0m0.000s

-- 
k_satoda
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