Re: Child-frame can not move to proper position when run "env GDK_SCALE=2 emacs"

[martin rudalics]

>> So it's just the same issue as everywhere else.  Now I wonder whether
>> the positions returned by `pos-visible-in-window-p' are wrong in this
>> case or the values passed to `set-frame-position'.  Maybe that's just
>> a philosphical question though.
>
> I guess you meant posn-at-point.

Which eventually falls back on `pos-visible-in-window-p', yes.

> That returns the position in pixels,
> unscaled, so I think it's correct.

Thus we can be sure that the caller of our position functions can
always contine to think in terms of unscaled positions so scaling is
"transparent"?

I think that after you fixed all this we should somewhere add a
paragraph to the Elisp manual explaining whether, why and how this
works.

martin