>>  > The window manager always selects the last created frame, i.e.
>>  > it seems it's impossible to create a new frame without selecting it.
>> 
>> The xfce window manager has an option for whether a new window should
>> be automatically given focus or not.
>
> I'm not sure I understand what you both are saying.  Are you saying
> that this problem is impossible to solve in Emacs?

The problem can be solved with this patch: