FYI, Unicode 9 only adds support for some characters (e.g. U+1F920, 🤠,
is correctly marked as wide starting from Unicode 9) but others require
an update to Unicode 10 (e.g. U+1F92F, 🤯) to be marked as wide.

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  Emoji that should be wide, according to Unicode 9, display incorrectly
  in the terminal

Status in gnome-terminal package in Ubuntu:

Bug description:
  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 
   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)

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