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Re: line-pixel-height beyond eol

From: Eli Zaretskii
Subject: Re: line-pixel-height beyond eol
Date: Thu, 14 Sep 2017 20:53:45 +0300

> Date: Thu, 14 Sep 2017 08:14:26 +0900 (JST)
> Cc: address@hidden, address@hidden
> From: Tak Kunihiro <address@hidden>
>   (progn (vertical-motion 1)
>          (dolist (vs (number-sequence 1 (1- (save-excursion
>                                               (goto-char (window-start))
>                                               (line-pixel-height)))))
>            (set-window-vscroll nil vs t) (sit-for 0.01))
>          (scroll-up 1))
> Let's assume a line with image of height 144 pixel is located on the
> top line.  When auto-hscroll-mode is off and (current-column) is large
> (the 144 pixel image is scrolled left), the top line looks 27 pixel
> height but (line-pixel-height) returns 144 pixel.  The inconsistency
> results in jump.

Would it help not to use the height of the top window line, but
instead simply use the value returned by frame-char-height?  That
takes its value from the frame's default font, and so should be
independent on what's in the window.

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