bug#10144: 24.0.91; `pop-up-frames' with dedicated windows is broken: `C-x C-f'

[martin rudalics]

>> When using C-x C-f.  But what about the hundred or so calls of
>> `find-file' in current Emacs sources?
>
> I think at least 90% of them are bugs in any case (they're typically
> wrapped in the infamous save-window-excursion)

After a short look at most 10% are within a `save-window-excursion'.
The rest is just "show me that file in some window".

> and making them pop up
> a new frame is not significantly better than making them signal
> an error.

We needed some sort of advise what program modes should typically use in
this case.

martin