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Re: (pos-visible-in-window-p t nil t) returns wrong position/is suboptim
From: |
Eli Zaretskii |
Subject: |
Re: (pos-visible-in-window-p t nil t) returns wrong position/is suboptimally documented. |
Date: |
Wed, 30 Sep 2015 12:32:39 +0300 |
> Date: Wed, 30 Sep 2015 08:56:11 +0000
> Cc: address@hidden
> From: Alan Mackenzie <address@hidden>
>
> "If POSITION is `t', that means to check the first visible position
> of the last visible screen line in WINDOW."
>
> doesn't seem quite right. If the text in the window is scrolled such
> that EOB is in the middle of the window, POSITION t gives the
> coordinates of the last line containing text, not the last visible
> screen line.
You mean, it isn't clear that "screen line" means line with text? I
could add "with text" if that's the issue (I thought it was obvious).
> How about something like:
>
> "If POSITION is `t', that means to check the first visible position
> of the last visible screen line in WINDOW which is at or above the
> end of the window's buffer."
Too complex, IMO. It took me 4 readings to understand what you mean,
and that's _after_ I've read the description of the situation you were
taking about.
> However 2: I think there's a bug in the functionality, too. If there is
> o - a text buffer
> o - with no terminating LF on its last line, and
> o - that last line is above the window's last line
> then (pos-visible-in-window t nil t) returns the coordinates of the last
> lines's EOL. This is the case in both a Linux virtual terminal and an X
> windows session.
It's not a bug. If you think it's important to mention this marginal
use case, I can add that, too.