Re: Strange draft problem

> > Here's the backtrace after running wl-draft-kill.
> > 
> > Debugger entered--Lisp error: (error "Attempt to delete minibuffer or sole ordinary window")
> >   signal(error ("Attempt to delete minibuffer or sole ordinary window"))
> >   error("Attempt to delete minibuffer or sole ordinary window")
> >   delete-window()
> >   (if (wl-window-deletable-p) (delete-window))
> 
> It seems that wl-window-deletable-p returns non-nil for non-deletable
> window.  Try to write the below code in your draft buffer which raises
> the error by wl-draft-kill, and evaluate it (C-x C-e at the right of
> the last closing paren).  Please confrim the result which is showed in
> minibuffer.  Recent emacs should return "(t nil nil)".
> 
> (list
>  (fboundp 'window-deletable-p)
>  (null (one-window-p))
>  (wl-window-deletable-p))
> 

I get (t nil frame).

I'm on Emacs 26.1, and the problem started right after I upgraded to
wanderlust-20190623.1332 from Melpa.