bug#45620: 28.0.50; Child frames should have their own border width and colour

[Alexander Miller]

>> >> - Currently the actual width of the border is still controlled by
the
>> >> `internal-border-width` parameter for both frame types. Should I
try to
>> >> do something about that as well? If yes, what's my entry point?
>> >
>> > Add a 'child-frame-border-width' parameter. But in this case I would
>> > propose to proceed as follows:
>> >
>> > - If for a frame the 'child-frame-border-width' was explicitly
set, use
>> > it.
>> >
>> > - If it was not set, use the 'internal-border-width' parameter.
>>
>> That's done now too, at least for X. I'll attach patches of my first
>> working drafts for both changes. Let me know if I'm on the right
path so
>> far.
>
> You're already at the end of it. Please document the changes in the
> Elisp manual and announce them as (probably incompatible) changes in
> NEWS.
>

Ok, all done now, see attached patch.

For the copyright I have asked my employer to make sure that the
copyright parts from my contract don't apply to the work I do on my own
time like this, but most of the company will still be on holidays or on
sick
leave, so it could be a few days before I get an answer.

0001-Add-distinct-controls-for-the-appearance-of-child-fr.patch
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