Multiple calls to BzrDir.open_branch() return different objects

[John A Meinel]

Because of how locking works, it seems to me that multiple calls to
BzrDir.open_branch() or open_repository() or open_working_tree() should
return the same object.

Otherwise doing:

dir = BzrDir.open(path)
branch = BzrDir.open_branch()
branch.lock()
try:
  do_something(dir.open_working_tree())
finally:
  branch.unlock()

Will probably cause a deadlock if anything in do_something calls
'wt.branch'.

The current code isn't terrible. It just doesn't seem optimal.

John
=:->

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