git rebase -i -p broken?

[Avi Kivity <avi@redhat.com>]

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Consider this scenario:
- commit some patch (named 'a')
- merge a random branch
- commit a fix to patch a
- since I haven't pushed yet, I want to squash a and a-fix together, to 
prevent bisect problems
- fire up 'git rebase -i -p a^'

Now the problems begin:
- the todo list shows up the branch's commits as well as my current 
branch.  But I don't want to commit the branch's commits in my own 
branch.  Replaying the merge should be enough.  Looks like a missing 
--first-parent somewhere.
- removing the spurious commit from the todo, and moving a-fix after a 
and marking it as a squash action, I get
   Refusing to squash a merge: 51ca22d7afb7433332ae41d0c2e3bab598048c21
  even though that's not a merge
- using git commit --amend instead of squash confuses git in some other way

Attached is a script that generates a test case.  With some $EDITOR 
hacks it can even be convinced to be an automated test case.

All this using 1.6.0.2.

-- 
error compiling committee.c: too many arguments to function


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!#/bin/sh -e

git --version
mkdir repo
cd repo
git init
touch a
touch 0
git add 0
git commit -m 'zeroth commit'
git add a
git commit -m 'first commit'
git checkout -b branch
touch b
git add b
git commit -m 'second commit (branch)'
git checkout master
touch c
git add c
git commit -m 'third commit'
git merge branch
touch d
git add d
git commit -m 'fifth commit'
git rebase -i -p HEAD~4