A long lived branch was a pain even in the CVS days. I'm in particular thinking about the "aviary" branch (for Phoenix/Thunderbird) Mozilla had for quite a whil

A long lived branch was a pain even in the CVS days. I'm in particular thinking about the "aviary" branch (for Phoenix/Thunderbird) Mozilla had for quite a while. Of course tooling can make it harder — there was no such thing as rebasing on CVS.