largefiles: restore R status of removed largefiles correctly at "hg rollback" Before this patch, removed or forgotten largefiles aren't treated as removed ("R") after "hg rollback". Removed ones are treated as missing ("!") and forgotten ones are treated as clean ("C") unexpectedly. "overriderollback" uses "normallookup" to restore status in lfdirstate for largefiles other than ones not added in rollback-ed revision, but this isn't correct for removed (or forgotten) largefiles. This patch uses "lfutil.synclfdirstate" to restore "R" status of removed (or forgotten) largefiles correctly at "hg rollback". This is a temporary way to fix with less changes. For fundamental resolution of this kind of problems in the future, lfdirstate should be rollback-ed as a part of transaction, as same as dirstate.

largefiles: factor out synchronization of lfdirstate for future use

largefiles: put whole rollback-ing process into the same "wlock" scope Before this patch, there are three distinct "wlock" scopes in "overriderollback": 1. "localrepository.rollback" via original "rollback" command, 2. "merge.update" for reverting standin files only, and 3. "overriderollback" specific "wlock" scope (to synchronize largefile dirstate) But these should be executed in the same "wlock" scope for consistency.

tests: use a decorator for hghave checks