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bug#32060: Horizontal Scrolling (Current Line): Wrong line gets h-scroll

From: Lars Ingebrigtsen
Subject: bug#32060: Horizontal Scrolling (Current Line): Wrong line gets h-scrolled.
Date: Thu, 26 Nov 2020 14:23:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Keith David Bershatsky <esq@lawlist.com> writes:

> Step 4:  Place the cursor at the very end of the buffer; i.e., at the very 
> end of the last long line of text.  Make sure that it gets horizontally 
> scrolled.
> Step 5:  Press the arrow key up one (1) time.
> Step 6:  Press M-Left one (1) time.  The cursor should now be on the second 
> to the last line in the buffer, at the beginning of the word "lobortis."
> Step 7:  Now press the arrow keys up or down and watch as the wrong line gets 
> horizontally scrolled.  The line that was last visited before moving up/down 
> is the line that gets horizontally scrolled instead of the current line.

(This bug report unfortunately got no response at the time.)

I was able to reproduce this in Emacs 26, but in Emacs 28 it behaves
slightly different -- it's still wrong, but not quite in the same way.
That is, it only begins scrolling lines (the wrong lines) after moving a
bit a bit more.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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