Bug#847479: xterm: display issue with double-width character like 🍸 on the last column via ncurses

[Vincent Lefevre <vincent@vinc17.net>]

Package: xterm
Version: 327-1
Severity: minor

In Mutt, when a double-width character from the subject appears on the
last column (in the Mutt index menu), then the left part of the second
half of the character is visible. Something like that.

For instance, if the character rendering would be denoted by:

  12345678

where 1234 would correspond to the last column and 5678 would
correspond to the next column, where only the pixels in 5 would
be visible before the right edge of the xterm window, then what
is visible seems to be the pixels from 5.

Said otherwise, the behavior is like if xterm would render the
character in its window (thus the 12345 part) then cleared the
last column (1234).

This is very similar to bug 844325.

-- System Information:
Debian Release: stretch/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 4.8.0-2-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages xterm depends on:
ii  libc6           2.24-8
ii  libfontconfig1  2.11.0-6.7
ii  libice6         2:1.0.9-1+b1
ii  libtinfo5       6.0+20161126-1
ii  libutempter0    1.1.6-3
ii  libx11-6        2:1.6.4-2
ii  libxaw7         2:1.0.13-1
ii  libxft2         2.3.2-1
ii  libxinerama1    2:1.1.3-1+b1
ii  libxmu6         2:1.1.2-2
ii  libxpm4         1:3.5.11-1+b1
ii  libxt6          1:1.1.5-1
ii  xbitmaps        1.1.1-2

Versions of packages xterm recommends:
ii  x11-utils  7.7+3

Versions of packages xterm suggests:
pn  xfonts-cyrillic  <none>

-- no debconf information