GNU bug report logs - #61361
cursor cannot be at the start of overlay that starts with a newline

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Message #10 received at control <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xinyang Chen <chenxy <at> mit.edu>
Cc: 61361 <at> debbugs.gnu.org
Subject: Re: bug#61361: cursor cannot be at the start of overlay that starts
 with a newline
Date: Wed, 08 Feb 2023 15:08:43 +0200

tags 61361 wontfix
thanks

> From: Xinyang Chen <chenxy <at> mit.edu>
> Date: Tue, 7 Feb 2023 23:29:31 -0500
> 
> steps to reproduce:
> ;; test line
> (if (and (boundp 'overlay) (overlayp overlay)) (delete-overlay overlay))
> (setq overlay (make-overlay 1 2))
> (overlay-put overlay 'display "\nhello")
> ;; same result if you do this intead
> ;; (overlay-put overlay 'display (propertize "\nhello" 'cursor 0))
> 
> cursor does not display in the first line.

Emacs cannot do what you are asking because the newline leaves no
glyph on display.  So the display engine cannot place the cursor on
the newline as it does on other characters, which do have glyphs.

This is a limitation of the 'cursor' property feature.  Sorry.

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