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bug#18195: 24.3.92; window-screen-lines is not accurate

From: martin rudalics
Subject: bug#18195: 24.3.92; window-screen-lines is not accurate
Date: Wed, 06 Aug 2014 19:46:17 +0200

> You are talking about things that are possible only on the C level,
> not from Lisp.  My point was that we don't expose enough APIs to Lisp
> to allow such applications, and you now agreed with me.

I was over-complicating things.  The solution is much simpler and all
tools are already on board.  Dmitry just has to insert his overlays
where he wants them and run `window-text-pixel-size' over that window.
If the text including the overlays fits he's done.  Otherwise, he has to
remove the overlays and proceed with whatever alternate solution he has.
No hands needed.


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