GNU bug report logs - #41332
27.0.60; :underline property doesn't work well with newline in :before-string

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: Bug Report Emacs <bug-gnu-emacs <at> gnu.org>
Subject: 27.0.60; :underline property doesn't work well with newline in
 :before-string
Date: Sat, 16 May 2020 13:18:15 -0400

[Message part 1 (text/plain, inline)]

What I did: I inserted a fake newline by adding a :before-string “\n” overlay in the middle of a link. 
The problem: the underline goes all the way to the right (without :extend t)
Reproduce: 
1. Open an Org document, insert a link (C-c C-l some text RET some text RET)
2. M-: and run this code:

(let* ((beg (point))
       (end (1+ (point)))
       (ov (make-overlay beg end nil t)))
  (overlay-put ov 'before-string "\n"))

What I get (overlay line break):


What I want (insert a hard line break):


In GNU Emacs 27.0.60 (build 3, x86_64-apple-darwin19.4.0, NS appkit-1894.40 Version 10.15.4 (Build 19E287))
of 2020-05-16 built on missSilver
Repository revision: f27187f963e9e36435b508e29256e048799e0ff2
Repository branch: emacs-27
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.4

Recent messages:
Quit
Making completion list...
Quit
flywrap-insert-newline
Entering debugger...
Back to top level
next-line: End of buffer [2 times]
Auto-saving...
Quit
s-b is undefined

Configured using:
'configure --with-modules --with-pdumper=yes
--oldincludedir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/libxml2/
PKG_CONFIG_PATH=/usr/local/Cellar/zlib/1.2.8/lib/pkgconfig:/usr/local/lib/pkgconfig:/opt/X11/lib/pkgconfig'

Configured features:
RSVG GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS XIM
NS MODULES THREADS PDUMPER LCMS2

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_CN.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug sendmail help-fns radix-tree cl-print
debug backtrace help-mode vc-git diff-mode org-element avl-tree
generator ol-eww ol-rmail ol-mhe ol-irc ol-info ol-gnus nnir gnus-sum
url url-proxy url-privacy url-expand url-methods url-history mailcap shr
url-cookie url-domsuf url-util url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs json map url-vars svg xml dom
browse-url gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int
gnus-range message rmc puny rfc822 mml mml-sec password-cache epa
derived epg epg-config mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader gnus-win gnus nnheader gnus-util rmail
rmail-loaddefs rfc2047 rfc2045 ietf-drums text-property-search seq
byte-opt gv bytecomp byte-compile cconv mail-utils mm-util mail-prsvr
wid-edit ol-docview doc-view jka-compr image-mode exif dired
dired-loaddefs ol-bibtex bibtex ol-bbdb ol-w3m org ob ob-tangle ob-ref
ob-lob ob-table ob-exp org-macro org-footnote org-src ob-comint
org-pcomplete pcomplete comint ansi-color ring org-list org-faces
org-entities time-date subr-x noutline outline easy-mmode org-version
ob-emacs-lisp ob-core ob-eval org-table ol org-keys org-compat advice
org-macs org-loaddefs format-spec find-func cal-menu easymenu calendar
cal-loaddefs cl-loaddefs cl-lib tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/ns-win ns-win
ucs-normalize mule-util term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame minibuffer cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads kqueue cocoa ns
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 158244 17844)
(symbols 48 18218 1)
(strings 32 59614 2665)
(string-bytes 1 2005707)
(vectors 16 28916)
(vector-slots 8 331738 19060)
(floats 8 197 132)
(intervals 56 447 0)
(buffers 1000 15))

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