changectx descendants()

[Berkes Adam]

Hi,

I would like to get all changes from a change context (update hook):

update = [ctx]
update.extend(ctx.descendants())

Unfortunately if there are multiply changes on two heads which has been 
merged at the end, and all these changesets are pushed, only the merge 
and changes of 1 (before merge) head are added to the array:

The push debug says:
list of changesets:
7ef0ad485a6d5e59ffc31eeeea979af6ca6ebee3
6688de837da95ba85d7931978b91905d814d1dc8
616bd3b59a63784a87b5cdad3d77d3ab1ef1cb15
adding changesets
add changeset 7ef0ad485a6d
add changeset 6688de837da9
add changeset 616bd3b59a63

However my debug says:
descendants:
[<changectx 7ef0ad485a6d>, <changectx 616bd3b59a63>]

(I want all those changesets mentioned in 'list of changesets')

I supposed descendants() follow all parents. Am I retrive this info 
wrongly? Also: is there 'more' documentation on core classes like 
changectx or revlog?

Thanks in advance,
Adam Berkes