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

From: Dmitry Gutov
Subject: bug#18195: 24.3.92; window-screen-lines is not accurate
Date: Tue, 05 Aug 2014 14:24:59 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0

On 08/05/2014 02:16 PM, martin rudalics wrote:

Aha... Could you try whether `window-text-pixel-size' could be used for

It won't help to determine how much space is left below the current line if the current line is the last in the buffer but not in the window, right?

> `window-text-height' with PIXELWISE t should give you the overall
> height of the window.

`count-screen-lines' already helps with "space above the current line", and we can find out the total height of the window in pixels. So if I'm going to do the arithmetics myself, the one thing missing is the accurate value of the height of a line in the buffer.

How do I obtain it (let's consider it mostly-constant)?

If things like line spacing are involved you really should calculate

The docstring of `window-screen-lines' seems to claim that it's suitable. The implementation looks kinda right, too, but the result it returns is not accurate.

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