bug#9310: BadWindow error with quail guidance frame

[Stefan Monnier]

>>>> emacs -Q --eval "(setq default-frame-alist '((minibuffer . nil)))" --eval
>>>> (quail-define-package "Agda" "UTF-8" "A" t)'
>>>> C-u C-\ agda RET
>>>> M-%
>>>> and I get the appended backtrace.  As the input method name explains,
>>>> I bump into this problem when I use Agda (i.e. pretty often these days).
>>> Is it possible that the frame switched to (0x8c793d8 at #13) is deleted?
>> AFAIK no frame is deleted in the above scenario, and the frame's
>> `terminal' field is not NULL (if that's what you were asking).
>> 0x8c793d8 is the minibuffer-only frame.
>> IIUC your question, you can't reproduce it on your end?
> No I can not.

Can someone help me figure out how to debug this (my X11 programming is
part rusty part nonexistent)?


        Stefan