bug#55103: 29.0.50; Server mode + reuseable-frames + switch-to-buffer-other-window + *scratch* => hang

[martin rudalics]

> But in this case, I think it should be possible to avoid that initial
> dummy frame, surely.  I've added Martin to the CCs; perhaps he has some
> comments here.

Not really.  Generally, t seems a bad choice for 'reusable-frames', it
might also return a tooltip frame.  It may be used on TTYs but I doubt
that would justify it.

martin