svn: invalid option: --internal-diff

[wujekbogdan]

I have installed a Modific plugin (btw: thanks - it's a great tool!) and I have noticed an error in the console:
svn: invalid option: --internal-diff

I have switched svn_use_internal_diff to false and It solved the problem.

So if it can cause a problem shouldn't it be set to false by default? If for a some reason it's better to use internal diff maybe it would be better to add some info about this issue to the documentation?

BTW, what does it mean to use internal diff? I assume that there are 2 possibilities: internal and external(?) diff. But what does it mean?

[gornostal]

http://svnbook.red-bean.com/en/1.7/svn.ref.svn.html

--internal-diff
Instructs Subversion to use its built-in differencing engine despite any external differencing mechanism that may be specified for use in the user's runtime configuration.

There were several complains about this error already.
I think it's a good point to make it false by default, since many people still use svn v1.6.

[gornostal]

done.