hgweb: fix duplication for some search queries
Given that N is maximum revision number in a repo, than if a revision with
number N-100n or N-100n+1 (for any integer n) is found with a hgweb search,
this revision is duplicated in search results.
basic:
creating
creating
creating
creating
fakeuncacheable:
creating
creating
creating
creating
creating
creating
repository tip rolled back to revision -1 (undo commit)
working directory now based on revision -1
repository tip rolled back to revision -1 (undo commit)
working directory now based on revision -1
setbeforeget:
0
creating
None