revset: note case-sensitive match in grep

revset: note case-insensitive matches in keyword and user

revset: expand help for contains predicate

patch: remove unused variable to make pyflakes test happy

patch: add lexists() to backends, use it in selectfile() At this point, all applydiff() filesystem calls should pass through fsbackend.

patch: move copyfile() into backends, abstract basedir

patch: merge makerejlines() into write_rej()

patch: extract fs access from patchfile into fsbackend Most filesystem calls are already isolated in patchfile but this is not enough: renames are performed before patchfile is available and some chmod calls are even done outside of the applydiff call. Once all these calls are extracted into a backend class, we can provide cleaner APIs to write to a working directory context directly into the repository.

mq: fix qpush changes detection of renamed files patch.changedfile() was not considering renamed file source as changed.

httpconnection: correctly handle redirects from http to https Previously the connection cache for keepalives didn't keep track of ssl. This meant that when we connected to an https server after that same server via http, both on the default port, we'd incorrectly reuse the non-https connection as the default port meant the connection cache key was the same.