bug#64451: 30.0.50; split-root-window-right ignores side windows

[martin rudalics]

>> (display-buffer "*scratch*" '(display-buffer-in-side-window . ((side . 
right))))
>> M-x split-root-window-right
>>
>> I would expect the new window to be to the left of the side window (I
>> know this is counter-intuitive to splititng the root window, but it's
>> also intuitive given the nature of side windows...)
>>
>> I don't know if this is intentional. I also don't know if it's a
>> regression as it's not behavior I remember seeing until fairly recently.
>
> Martin, any comments?

There are two bugs.  The first one is that splitting a root window with
side windows is always an error unless a new side window on another side
should be made.  This should be fixed by the attached patch.

The second bug is that the 'split-root-window-...' functions probably
should split 'window-main-window' on that frame instead.  I'd rather
leave the fix for that to the people who wrote those functions.

martin

split-window.diff
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