[PATCH] branchingrev: find the start of the branch containing a node

[Thomas Arendsen Hein]

* Thomas Arendsen Hein <thomas at intevation.de> [20080226 21:39]:
> 
>     o   5~~ = 0
>     |
>     o   4~~ = 0
>    /|
>   o |   3~~ = 3
>   | |
>   | | o 2~~ = 2
>   | |/
>   | o   1~~ = 0
>   |/
>   o     0~~ = 0

On IRC we just found a better semantic, at least for the strip use
case: If I would strip foo~~ only the head(s) that are children of
foo will vanish, but no other head, so:

    o   5~~ = 3
    |
    o   4~~ = 3
   /|
  o |   3~~ = 3
  | |
  | | o 2~~ = 2
  | |/
  | o   1~~ = 1
  |/
  o     0~~ = 0

Thomas

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