Branch Management questions

From: Leam Hall <leamhall@gmail.com>
Date: Oct 15, 2020, 09:51 UTC
Message-ID: <595540a9-0000-8dcd-c555-3168d1b2d066@gmail.com>

1. Two developers.
   Dev A is working on Branch A, off a release_candidate branch.
   Dev B is working on Branch B, off the same release_candidate branch.
   Branches usually run 1-4 weeks.
   Dev A does some work that would help Branch B.
   How does Dev A get the Branch B work that is needed, in a
     way that does not confuse the merge process at the end
     of the release cycle?

2. One developer.
   Working on Branch P, realizes that a new functionality X is
     needed.
   X isn't specific to Branch P, but critical to it.
   What is the best way to deal with X, knowing that further work
     on X will need to be done?