Correct optimization from 3464f5e77f34; add a test.
If there are two (or more) heads that point to the same .hgtags
node, we can safely skip parsing the file in all but the last head.
(In 3464f5e77f34, we were parsing the file in the first head and
skipping all the others.)
adding a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% expect ssl error
pushing to http://localhost:20059/
searching for changes
ssl required
% expect authorization error
pushing to http://localhost:20059/
searching for changes
push not authorized
% expect authorization error: must have authorized user
pushing to http://localhost:20059/
searching for changes
push not authorized
% expect success
pushing to http://localhost:20059/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
rolling back last transaction
changegroup: u=remote:http
% expect authorization error: all users denied
pushing to http://localhost:20059/
searching for changes
push not authorized
% expect authorization error: some users denied, users must be authenticated
pushing to http://localhost:20059/
searching for changes
push not authorized