>> > I can not see why only displayed buffers should be interesting. A
>> buffer
>> > that is not currently displayed could also have a 'window property
>> > pointing to some of those windows we are interested in. Or?
>>
>> No. A dead window is never resurrected. The window property of that
>> overlay is of no use until you reassign it the value of a live window.
>
>
>
> Maybe we are miscommunicating. I am talking about displayed BUFFERS
> while I wonder if you and Juanma perhaps talks about displayed WINDOWS.
>
> Or am I misunderstanding something?
Above you said "a buffer ... could have a 'window property". I don't
know of such a property of a buffer. I've been always talking about
overlays with a 'window property. Overlays belong to a buffer. Note
that a buffer can have two or more overlays with different window
properties. Hence the buffer's text may appear differently when it is
simultaneously displayed in two windows. When I remove the 'window
property from an overlay the overlay should appear in all windows
displaying the buffer the overlay belongs to.