On Sun, 8 Sept 2024 at 15:21, martin rudalics <rudalics@gmx.at> wrote:

>  >>
>  >> Do you get an assertion failure already before the C-x 5 2?
>  >
>  > No.
>
> Thanks.  Did you ever get an assertion failure for the original frame?
>

I don't think so, no.

If not, then we should try to understand why not.  Please with pristine
> master replace the initial assignment of 'frame-size-history' in frame.c
> from
>
>    frame_size_history = Qnil;
>
> to
>
>    frame_size_history = Fcons (make_fixnum (100), Qnil);
>
> start Emacs -Q and tell me the contents of the *frame-size-history*
> buffer.


There isn't one.


> Can you try not using any scaling experimentally?  Jan always complained
> that GTK does not handle scaling orderly (that is, in our sense).
>

I changed scaling to 100%, and it doesn't make any difference.

Thanks for the explanations of the other points.

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