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Nomenclature:

A
leaf
is a check-in with no descendants in the same branch.
An
open leaf
is a leaf that does not have a "closed" tag and is thus assumed to still be in use.
A
closed leaf
has a "closed" tag and is thus assumed to be historical and no longer in active use.

Open leaves:

2009-11-21
17:52		[a3ac45a8a2] Leaf: Add counts to the bottom of preview (user: dmitry, tags: trunk, v1.4)