Keybind or Button-click to Minimize (but not remove) Composer

That relates to another problem I have, and having temporary multiple drafts would possible fix that. It’s come to a point where I begin typing, I get a message elsewhere and would like to temp-save what I have in progress. I have to stop, copy the title, paste into Sublime Text, go back to the window, copy the text body I have so far and then put that into Sublime Text as well. It’s getting cumbersome. But I can make a new topic for that now.