bug#41888: 27.0.91; fix ACTION argument of display-buffer

[Richard Kim]

gud-common-init function in emacs 27 seems to have a bug in how it calls
display-buffer. The second argument passed is ACTION. According to
docstring of display-buffer, the list of functions need to be a list
within a list. The attached patch adds the missing extra pair of
parenthesis.

0001-fixed-ACTION-argument-of-display-buffer-call.patch
Description: fix one display-buffer call

In GNU Emacs 27.0.91 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.18)
 of 2020-06-12 built on kimr-laptop
Repository revision: 22f4fba8a903874ba63f8f479fa40b1dfe12850f
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04 LTS

Recent messages:
Saving file /home/kimr/repos/e/emacs/lisp/progmodes/gud.el...
Wrote /home/kimr/repos/e/emacs/lisp/progmodes/gud.el
~/repos/e/emacs/lisp/progmodes 
Quit
Mark set [2 times]
Using try-expand-line
No further expansions found
No expansion found [5 times]
Quit
Mark set [5 times]

Configured using:
 'configure '--program-transform-name=s/^ctags$/ctags.emacs/'
 --with-file-notification=yes --with-imagemagick --with-modules
 --with-pdumper=yes --with-sound=yes --with-x-toolkit=yes --with-xml2
 --without-compress-install --with-gif=no --prefix
 /home/kimr/opt/emacs27/20200612 CFLAGS=-O3'

Configured features:
XPM JPEG TIFF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS PDUMPER LCMS2 GMP