When pushing, 'remote' should default to the tracked branch, or empty

By jaffathec... on August 24, 2009 16:45 (imported from Google Code)

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(1.9.1)

When I select 'push' while on my local master branch, the default in "remote"
is "RB_1.6". This has led to me accidentally pushing to the wrong remote
branch.

The "remote" option should be empty by default in my opinion. This means it
pushes to whatever remote branch the local branch is tracking. This is the
usual case.

The less-usual case is pushing to a branch you're not tracking, at this point
the user should have to select a remote branch to push to, the GUI should not
assume a particular branch.