Bug#912329: gnome-terminal: incorrect rendering of some box characters

[Vincent Lefevre]

Package: gnome-terminal
Version: 3.30.1-1
Severity: normal

When I view the following

Box drawing alignment tests:                                          █
                                                                      ▉
  ╔══╦══╗  ┌──┬──┐  ╭──┬──╮  ╭──┬──╮  ┏━━┳━━┓  ┎┒┏┑   ╷  ╻ ┏┯┓ ┌┰┐    ▊ ╱╲╱╲╳╳╳
  ║┌─╨─┐║  │╔═╧═╗│  │╒═╪═╕│  │╓─╁─╖│  ┃┌─╂─┐┃  ┗╃╄┙  ╶┼╴╺╋╸┠┼┨ ┝╋┥    ▋ ╲╱╲╱╳╳╳
  ║│╲ ╱│║  │║   ║│  ││ │ ││  │║ ┃ ║│  ┃│ ╿ │┃  ┍╅╆┓   ╵  ╹ ┗┷┛ └┸┘    ▌ ╱╲╱╲╳╳╳
  ╠╡ ╳ ╞╣  ├╢   ╟┤  ├┼─┼─┼┤  ├╫─╂─╫┤  ┣┿╾┼╼┿┫  ┕┛┖┚     ┌┄┄┐ ╎ ┏┅┅┓ ┋ ▍ ╲╱╲╱╳╳╳
  ║│╱ ╲│║  │║   ║│  ││ │ ││  │║ ┃ ║│  ┃│ ╽ │┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▎
  ║└─╥─┘║  │╚═╤═╝│  │╘═╪═╛│  │╙─╀─╜│  ┃└─╂─┘┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▏
  ╚══╩══╝  └──┴──┘  ╰──┴──╯  ╰──┴──╯  ┗━━┻━━┛  ▗▄▖▛▀▜   └╌╌┘ ╎ ┗╍╍┛ ┋  ▁▂▃▄▅▆▇█
                                               ▝▀▘▙▄▟

in gnome-terminal, the rendering is incorrect. See the first box.
Instead of getting double lines, I get heavy lines.

This occurs with Liberation Mono Regular 13.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-2-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-terminal depends on:
ii  dbus-user-session [default-dbus-session-bus]  1.12.10-1
ii  dbus-x11 [dbus-session-bus]                   1.12.10-1
ii  dconf-gsettings-backend [gsettings-backend]   0.30.0-1
ii  gnome-terminal-data                           3.30.1-1
ii  gsettings-desktop-schemas                     3.28.1-1
ii  libatk1.0-0                                   2.30.0-1
ii  libc6                                         2.27-8
ii  libdconf1                                     0.30.0-1
ii  libglib2.0-0                                  2.58.1-2
ii  libgtk-3-0                                    3.24.1-2
ii  libpango-1.0-0                                1.42.1-1
ii  libuuid1                                      2.32.1-0.1
ii  libvte-2.91-0                                 0.54.1-1
ii  libx11-6                                      2:1.6.7-1

Versions of packages gnome-terminal recommends:
ii  gvfs                               1.38.0-2
ii  nautilus-extension-gnome-terminal  3.30.1-1
ii  yelp                               3.30.0-1

gnome-terminal suggests no packages.

-- no debconf information
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