Currently, our default branch in tests is "master". This is the Git
default, but the Git default will likely change in the future, so it
makes sense to update our testsuite to be explicit about the branch
name. We'll ensure this continues by building against older versions of
Git as well as newer versions.
We use "main" for the new branch name, since that's the proposed value
upstream.
This commit was made entirely by automated means using the following
command:
git grep -l master t | xargs sed -i -e 's/master/main/g'
Fix 'panic: send on closed channel' when cherry-pick several commits.
The issue occurs when LFS files of cherry-picked commits do not
exist in LFS cache. The first smudge command closes incoming channel
of TransferQueue and never opens it again. Resolve issue by creating
TransferQueue each 'smudge' command.
