bug#20538: 24.4; Attempt to delete a surrogate minibuffer frame

[martin rudalics]

> Then your previous email telling me only about the function
> ediff-setup-windows-plain gives an ignorant user like myself already
> all the info he needs.

Well, in my first mail in this thread I wrote

>> I use
>>
>> (custom-set-variables
>>  '(ediff-window-setup-function (quote ediff-setup-windows-plain)))
>>
>> which avoids that the control panel appears on a separate frame.

Hence I thought you would be already aware of the real nature of
`ediff-setup-windows-plain' ;-)

>>   > Perhaps the error message could be changed to something like
>>   >
>>   >    "Attempt to delete frame with a surrogate minibuffer for frame XYZ"
>
> Is the problem with the above that frames do not have
> selfexplanatory unique names?  Oh well, too bad.

We could use (frame-parameter frame 'name) but it's not unique.

>> Maybe we should say in the documentation of `delete-frame' something
>> like
>>
>>     A frame may not be deleted if its minibuffer serves as surrogate
>>     minibuffer for another frame.
>
> Yes, thanks, that would be better than the current phrase.  If the
> buzzword "surrogate" appears also in the corresponding section of
> the elisp manual, I might have never started this thread.

OK.  Unless someone has a better idea I'll rewrite it that way.

martin