view mercurial/pure/__init__.py @ 23251:85c634ff395a

transaction: drop backupentries logic from startgroup and endgroup

The `startgroup` and `endgroup` methods are used in a very specific
context to wrap a very specific operation (revlog truncation). It does
not make sense to perform any other operations during such a "group"
(eg:file backup). There is currently no user of backupfile during a
"group" so we drop the group-specific code and restrict authorized
operations during "group".