bug#24500: 25.1.50; Can't other-window from minibuffer if Ediff control panel frame present

[Tino Calancha]

On Thu, 21 Sep 2016, Richard Copley wrote:

> C-x C-o doesn't do anything useful when reading from the minibuffer, if
> an Ediff control panel frame is present (but not activated).

> From 'emacs -Q':

> ;; To illustrate what C-x C-o is supposed to do:
> M-x     ; select minibuffer
> C-x C-o ; select *scratch* window while reading from minibuffer
> ESC ESC ESC ; quit

> ;; To illustrate what goes wrong when Ediff is active:
> C-x b * RET ; create a spare buffer so we can invoke ediff-buffers
> M-x ediff-buffers RET RET RET
> C-x 5 o ; Activate main frame
> M-x     ; Select minibuffer
> C-x C-o ; Something not very useful happens

I guess this is a bug.  It's annoying that you cannot use `C-x o'
from the minibuffer.
Note that, if you are in an Emacs session without gui,
`C-x o' will do the right thing.