Backport CMS 7924 to 7.8: Revision history - one particular revision access - revision predecessor access

I wanted to create an excel plugin for the cms to extract documents diff between to dates.
In order to develop it, I tried to use getPredecessor() on Revision.

I failed since the revision.index properties does not match the index in the revisionHistory list of revision (so history.getRevision(index - 1) does not match predecessor).

The load() fonction in revisionHistory

Possible patch : RevisionHistory => Revision getRevision(int index) :

Revision getRevision(int index) {
load();
if (index >= 0 && index < list.size())

{ return list.get(list.size() - 1 - index); }

return null;
}

Or : remove Collections.reverse(list); in "RevisionHistory.load() "

(but i didn't study the consequence of the second solution)

Best regards.