bug#11960: Defective layout change on M-x ediff-buffers

[Lars Ingebrigtsen]

martin rudalics <rudalics@gmx.at> writes:

>> 1) start emacs via emacs -Q
>> 2) open a buffer A
>> 3) use C-x 3 to open another buffer (buffer B) next to A (side-by-side)
>> 4) use M-x ediff-buffers to compare A and B.
>>
>> Instead of leaving the buffers arranged side-by-side (as obtained from
>> C-x 3), the buffers are displayed vertically (on top of each other) when
>> using 4). However, I would expect emacs to open them side-by-side as
>> well .
>
> Your expectation sounds intuitive.  But the behavior of ediff is
> governed by the value of `ediff-split-window-function' and it would be
> wrong to override that.  Moreover, at the time ediff applies that
> function, the original frame layout has been already destroyed.
>
> So you can either try to use something like the sloppy
>
> (add-hook 'ediff-before-setup-hook 'my-check-configuration)
>
> (defun my-check-configuration ()
>   (setq ediff-split-window-function
>       (if (window-combination-p (frame-root-window))
>           'split-window-below
>         'split-window-right)))
>
> or permanently set `ediff-split-window-function' to `split-window-right'.

So I guess there's nothing to fix here, and I'm closing this bug report.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no