git gc == git garbage-create from removed branch

[Hallvard Breien Furuseth <h.b.furuseth@usit.uio.no>]

After removing a branch, 'git gc' explodes all objects
which were only in that branch.  Git filled up my disk that
way when I had cherry-picked from a big remote repo and then
did git remote rm.  Tested with Git 1.7.10.1 and 1.7.1.

$ git clone --bare --branch linux-overhaul-20010122 \
	git://git.savannah.gnu.org/config.git
...
Receiving objects: 100% (3263/3263), 517.15 KiB | 295 KiB/s, done.
...
$ cd config.git/
$ git tag -d `git tag`
...
$ git branch -D master
$ git gc
Counting objects: 1183, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (751/751), done.
Writing objects: 100% (1183/1183), done.
Total 1183 (delta 457), reused 1113 (delta 393)

$ find objects/?? -type f -print | wc -l
2080

$ git reflog expire --expire=now; git gc --prune=now
Counting objects: 1183, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (687/687), done.
Writing objects: 100% (1183/1183), done.
Total 1183 (delta 457), reused 1183 (delta 457)

$ ls objects/
info/  pack/

3263 fetched objects == 2080 loose objects before prune +
HEAD's 1183 objects.

-- 
Hallvard