mwahahaha! composing in a tmux split pane

[Cameron Simpson]

On the topic of firing off composition in a separate window so that the 
main mutt can continue on immediately, monitoring for new email etc, I'm 
working on a change to my muttedit script to do all this inside tmux:

Start the main mutt in a tmux session.

Have muttedit:
- spawn a detached tmux session for composition as at present, detached
- split the current tmux window and attach to the composition session in 
  the new pane

This effectively "opens a composition window below the index view". Like 
an unadorned mutt reply does, but detachable. There are still some pain 
points :-(

Cheers,
Cameron Simpson <cs at cskk.id.au>