Bug#691362: zenity: glib errors for unfinished input and slow rendering

[Thanatermesis]

Package: zenity
Version: 3.4.0-2
Severity: normal

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This bug happens originally by a slow rendering interface, but can
be considered also other bugs that comes from this slowness, so let's
reproduce first the first problem:

$ seq 10000  | zenity --list --column="File" --column="Country" --column="Provider" --hide-column=1 --text="select a configuration" --height="420" --width="440"

This generates a big list of options, but we can see that the list is
generated pretty slow even on powerful machines, this makes the zenity
interface pretty unstable if we pick an option before that the entire
list finishes to be generated, for example, if we do it with the mouse
and click in Ok, we have FD descriptor bug like this one:

(zenity:13784): GLib-WARNING **: /build/buildd-glib2.0_2.33.12+really2.32.4-2-i386-TMMpf5/glib2.0-2.33.12+really2.32.4/./glib/giounix.c:411Error while getting flags for FD: Bad file descriptor (9)

If we do the same but using the keyboard instead of the mouse
(arrow-keys down + enter), the enter doesn't seems to act until we press
it multiple times, when finally got it we have a lot of errors in the
terminal and some values that seems to come from the input, like: 

(zenity:13846): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)' failed  (null)205(null)205(null)205(null)20514205(null)20513



- -- 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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