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X-Bullshit: property callback-based solution 
Subject: Re: [9front] Mouse clipping patch
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> On Jul 13, 2021, at 11:16 AM, Jos=C3=A9 Miguel S=C3=A1nchez Garc=C3=ADa =
<soy.jmi2k@gmail.com> wrote:
>=20
> Innermost-focused rio gets the control, with a key for "giving up" the
> focus (going then a "level" up in the stack) is what i propose.

Now you are breaking the fourth wall and making rio aware that there
may (or may not?) be another world outside it.  By default rio
passes input down to its children, after breaking this fourth wall,
rio has to process the input somehow and determine if it wants to
"give up" the focus to its parent.  What if its child that has the
focus is a rio?  How does it know how many of its descendent rios
have "given up"?=