Bug#691357: zenity: window doesn't come to the center of the screen when using --forms

[Thanatermesis]

Package: zenity
Version: 3.4.0-2
Severity: normal

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When using the option --forms, the window doesn't appears on the center
of the screen, which is the default in all the other options.

How to reproduce:
$ zenity --info
$ zenity --forms


- -- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-3-686-pae (SMP w/2 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages zenity depends on:
ii  libc6               2.13-35
ii  libgdk-pixbuf2.0-0  2.26.1-1
ii  libglib2.0-0        2.32.3-1
ii  libgtk-3-0          3.4.2-4
ii  libnotify4          0.7.5-1
ii  libpango1.0-0       1.30.0-1
ii  libwebkitgtk-3.0-0  1.8.1-3.3
ii  libx11-6            2:1.5.0-1
ii  zenity-common       3.4.0-2

zenity recommends no packages.

zenity suggests no packages.

- -- no debconf information

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