This is a library that package developers can use to provide user
friendly single window per frame execution of buffer exposing
commands, as well as to use in personal emacs configurations to attain
the same goal for packages that don’t use fullframe or the likes of
it themself.
Example: Setup magit-status to open in one window in the current
frame when called:
(require 'fullframe)
(fullframe magit-status magit-mode-quit-window :magit-fullframe nil)