appropriate mailing list for gitk patches

Hello folks,

I have a patch for gitk. Should i send it to this list, or is there some
other?  git/Documentation/SubmittingPatches mentions
git://ozlabs.org/~paulus/gitk (the master of which i based my commit
on), but never mentions any list(s) by name (only "the Git mailing
list", which i presume is this one).

Also, a minor question regarding patches: I wondered why patches do not
mention the commit id that the patch(es) are based on. My current guess
is that the diffs containing the sha1's is considered sufficient. Is
this the case? Are there more/other aspects?

Lennart