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Subject: bug#79787: 31.0.50; Unexpected point adjustment when passing over text that has 'invisible property and an overlay with 'display on top
Resent-From: Ihor Radchenko <yantar92@HIDDEN>
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From: Ihor Radchenko <yantar92@HIDDEN>
Date: Sat, 08 Nov 2025 10:43:37 +0000
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Hello,

Consider the following reproducer

 (let (ovs)
   (with-current-buffer (generate-new-buffer "*temp*")
     (display-buffer-below-selected (current-buffer) nil)
     (insert "\n\n12345789")
     (goto-char (point-min))
     (with-silent-modifications
       (search-forward "1")
       (backward-char)
       (put-text-property (+ (point) 2) (+ (point) 4) 'invisible t)
       (read-char "Press any key (part of 123456789 hidden)")
       (dolist (offset '(0 1 2 3 4 5 6 7 8))
	 (push (make-overlay (+ offset (point)) (+ offset (point) 1)) ovs)
	 (overlay-put (car ovs) 'display (copy-sequence "!")))
       (message "NOW, move cursor across 123456789 string, observe point jumping across some !"))))

When we put an overlay with 'display property on top of 'invisible text,
the overlay takes precedence and the text from 'display is visible on
place of the underlying text.

However, point adjustment does not seem to account for this scenario -
the point gets adjusted to bypass 'invisible text anyway, which is
unexpected as the point jumps over the visible overlay.

This issue has been originally reported in https://orgmode.org/list/87ms50z1bp.fsf@localhost


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.18.4) of 2025-04-28 built on localhost
Repository revision: 509cbe1c35b3dd005a53ac041f9c87ee53b8e115
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101018
System Description: Gentoo Linux

-- 
Ihor Radchenko // yantar92,
Org mode maintainer,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Ihor Radchenko <yantar92@HIDDEN>
Subject: bug#79787: Acknowledgement (31.0.50; Unexpected point adjustment
 when passing over text that has 'invisible property and an overlay with
 'display on top)
Message-ID: <handler.79787.B.176259863629644.ack <at> debbugs.gnu.org>
References: <87wm40954s.fsf@localhost>
X-Gnu-PR-Message: ack 79787
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Date: Sat, 08 Nov 2025 10:44:02 +0000

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79787: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D79787
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