From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: 31276@debbugs.gnu.org
Subject: bug#31276: 27.0.50; "Spurious" empty first line from before-string
Date: Thu, 26 Apr 2018 16:11:38 -0400 [thread overview]
Message-ID: <jwv604dbudh.fsf@iro.umontreal.ca> (raw)
Package: Emacs
Version: 27.0.50
Try the following:
% src/emacs -Q etc/NEWS --eval '(let ((ol (make-overlay (+ (point) 10) (+ (point) 10)))) (overlay-put ol (quote before-string) "\nhello\n"))'
C-u 1 C-v
You should see that the "scroll by 1 line" didn't actually scroll: it just
removed the "GNU Emacs " from your sight and left an empty line instead.
Arguably, this is right: `window-start` has to be one of the buffer's
positions, so it has to be either before or after the overlay, and the
overlay's string starts with a line-feed, so if window-start is placed
there, the window will start with an empty line.
But arguably this is also wrong: there is no empty-line at that position
in the buffer's normal rendering.
Whether you consider this as a bug report or a feature request, my point
is that when the window starts with a before/after-string and that
string starts with a line-feed, we should skip that line-feed rather
than waste a perfectly good line.
Stefan
next reply other threads:[~2018-04-26 20:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-26 20:11 Stefan Monnier [this message]
2018-04-28 9:40 ` bug#31276: 27.0.50; "Spurious" empty first line from before-string Eli Zaretskii
2018-04-28 13:13 ` Stefan Monnier
2018-04-28 14:04 ` Eli Zaretskii
2018-04-28 14:07 ` Eli Zaretskii
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