Changes to libdiff2 regarding apply/unapply diff.

[Dmitry Risenberg]

Hello kompare devs.

I am working on KDevelop interactive patch highlighting, and I need to
introduce some changes to libdiff2. The most important one is changing
differences location whenever a difference is applied/unapplied. For
example, when a difference is unapplied, all the following differences
have their destinationLineNumber updated, as if this particular
difference has never existed. Currently libdiff2 doesn't do anything
like this - apply/unapply only changes a flag in the difference. I
want to know whether such change may break anything, because I haven't
found any tests for libdiff2 and don't know the kompare code to judge
from it.

Please CC me as I am not subscribed to the list.

-- 
Dmitry Risenberg