bundle2: feed a unbundle20 to the `processbundle` function The unbundle can comes from multiple sources. (on disk file, peer, etc) and (ultimately) of multiple type (bundle10, bundle20). The `processbundle` is no longer in charge of creating the bundle.

bundle2: lock the repo during unbundle test We forgot the lock the repo. It's not too bad during tests, but the lock also still carry some transaction logic. (yes we need to get rid of this)

merge: keep destination filename as key in filemerge actions Gives more readable debug output and makes it possible to compare/merge actions later.

merge: keep destination filename as key in actions for merge with dir rename Avoids None: local renamed directory to b/c -> d updating:None 1/1 files (100.00%) and makes it possible to compare/merge actions later.

merge: include ancestor node in merge actions

merge with stable

repoview: use _gethiddenblockers in computehidden No functionality has changed, since we've only extracted the code into its own function. Now extensions can wrap _gethiddenblockers to provide their own blocker without polluting bookmarks or local tags.

repoview: add _gethiddenblockers method This is a standalone function that will provide the ability for extensions to wrap.

repoview: improve performance for computehidden (issue4206) For repos with a large number of heads (including hidden heads), a stale tag cache would cause computehidden to be drastically slower because of a the call to repo.tags() (which would build the tag cache). We actually don't need the tag cache for computehidden because we filter out global tags. This patch replaces the call to repo.tags with readlocaltags so as to avoid the tag cache.

tests: remove unused variables from test-pathencode.py caught by pyflakes