I had saved the draft multiple times before making the fatal deletion error. The 'blank' (no text) draft is still

in the drafts folder.

Re: Recoverable?

Most likely answer is <No> at this stage. If you happened to use Ctrl-X to cut the text and have done nothing else with the clipboard at all - there is the remote chance that pasting the contents of the clipboard somewhere may contain what you're looking for but <time> is not usually your friend in cases like this. Also, if you used the <Del> key to remove the contents and then re-saved the message, the info is gone.