Public bug reported:
When editing Unicode in the terminal, it is important for the terminal
and applications to agree on the width of characters. Otherwise, display
glitches will occur.
In prior versions of Unicode, the character width of emoji was
"ambiguous". As of Unicode 9, they are supposed to be double-wide and
take up two character cells. gnome-terminal displays them as
overlapping, single-wide characters, like it has for a long time. This
is a problem because many applications I use on Ubuntu now treat emoji
as double-wide. The behavior of gnome-terminal conflicts with the cursor
positioning in vim, for example.
I've long considered gnome-terminal to have the least buggy Unicode
implementation among terminal applications, and this may no longer be
the case.
The *desired behavior* of emoji is that they are double-wide: they take
up two character cells, advance the cursor by two cells when displayed,
and text-editing applications move the cursor by two cells when moving
past them. The *actual behavior* is inconsistent: typically, the emoji
advance the cursor only by one character cell, even though the text-
editing cursor moves by two character cells when moving past them,
causing the cursor to be misaligned with the text.
I hope this bug reporting interface lets me attach screenshots so I can
show the example with vim.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-terminal 3.18.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
Uname: Linux 4.4.0-57-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Feb 15 16:13:31 2017
InstallationDate: Installed on 2016-08-09 (190 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
JournalErrors:
Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000']
failed with exit code 1: Hint: You are currently not seeing messages from other
users and the system.
Users in the 'systemd-journal' group can see all messages. Pass -q to
turn off this notice.
No journal files were opened due to insufficient permissions.
SourcePackage: gnome-terminal
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-terminal (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1665140
Title:
Emoji that should be wide, according to Unicode 9, display incorrectly
in the terminal
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