Bug#746562: xserver-xephyr: large screen size causes immediate exit

[Heikki Piirainen <hp@iki.fi>]

Package: xserver-xephyr
Version: 2:1.15.1-1
Severity: important

”Xephyr :9 -screen 4096x4096” shortly displays a black screen and exits
silently after that.

Smaller screen sizes are no problem, e.g. “Xephyr :9 -screen 4096x1024”
works as expected.

2:1.15.99.902-1 from experimental has the same problem.

This is a regression: 2:1.14.5-1 works fine, and so did all the
previous versions I used to use over the years.

(In case you’re wondering: Xephyr is useful for taking huge screenshots
from things like Google Street View. ☺)

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (900, 'testing'), (300, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash