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Re: are there hooks for text becoming visible or hidden in a given windo


From: Eli Zaretskii
Subject: Re: are there hooks for text becoming visible or hidden in a given window?
Date: Fri, 25 Feb 2022 09:04:37 +0200

> Date: Thu, 24 Feb 2022 14:25:39 -0800
> From: Thomas Lord <lord@basiscraft.com>
> 
> Is there a way to mark a region of text in a buffer, so that when that 
> text becomes visible in any window, or when it stops being visible, a 
> hook is called and provided the location of the text in the buffer, and 
> the window in which its visibility has changed?

Please clarify what you mean by "visible" in this context.  I mean not
a couple of examples, but an exhaustive, complete definition.

> Watching scroll events would only cover part of the problem

Which part it won't cover, in your opinion?

> and I'm worried about the interactive performance of having to
> frequently search the range of visible text for text with a certain
> property or within a certain overlay.

Why do you think this could be expensive?  A typical window doesn't
show too much text.



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