Mouse paste buffer contents change when refocusing input field

[Victor Engmark]

How to reproduce:
1. Open an xterm window and a GNOME Terminal.
2. Type "foo" in the xterm window.
3. Type "bar" in the GNOME Terminal window.
4. Select "foo" in the xterm window.
5. Select "bar" in the GNOME Terminal window.
6. Start a Pidgin conversation.
7. Type "test" in the Pidgin conversation input field.
8. Select "test" in the input field.
9. Middle-click in the xterm window. At this point, "test" is pasted, as expected.
10. Middle-click in the GNOME Terminal window. At this point, "test" is pasted, as expected.
11. Left-click on the Pidgin input field, effectively de-selecting the text.
12. Middle-click in the xterm window. At this point, "foo" is pasted! That is, the previous paste buffer entry created by the xterm window.
13. Middle-click in the GNOME Terminal window. At this point, *nothing* is pasted!

This is inconsistent with other Ubuntu applications.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pidgin 1:2.10.3-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic i686
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
Date: Mon Sep 3 11:35:26 2012
ExecutablePath: /usr/bin/pidgin
InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release i386 (20120214.2)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
SourcePackage: pidgin
UpgradeStatus: Upgraded to precise on 2012-07-19 (45 days ago)