I'm not entirely sure why this extra newline is necessary; I haven't
done much digging other than looking at the commit that introduced this
issue.  Maybe the rest of custom-group-value-create does something fishy
and this patch only works around that…

WDYT?


Thank you for your time.


In GNU Emacs 28.0.50 (build 4, i686-pc-linux-gnu, GTK+ Version 3.24.5, cairo version 1.16.0)
 of 2020-01-08 built on little-buster
Repository revision: 724af7671590cd91df37f64df6be73f6dca0144d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

Configured using:
 'configure --with-xwidgets --with-cairo'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER LCMS2 GMP

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