Aw: svn log -r based on a start date suddenly no longer returns any revisions

[Andreas Stieger]

> svn log -r {2008-01-01T00:00:00}:{2019-02-20T10:21:03} [...] http://[...] 
> --xml -v
> [..] 
> It should find exactly 2 commits in this range

Check if all revisions (0:HEAD) on the root of the repository (not just trunk) 
are strictly monotonic increasing. If they are not, this can cause this issue. 
It is most frequently caused by importing repository history into a subtree of 
an existing repository.

Andreas