metacity doesn't detect hung apps like compiz does

[Alan Jenkins]

To observe expected behaviour:

Log in as "Ubuntu" (3D).
Open a terminal
Run "gcalctool" from the terminal
Switch back to the terminal
press ctrl+Z to suspect gcalctool

Now try to close gcalctool.
After a few seconds, Compiz will recognise that gcalctool is not responding, and offer an option to kill it.

But if you log in to "Ubuntu (2D)" instead, you don't get that "force quit" option. gcalctool just sits there, refusing to close.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: metacity 1:2.34.1-1ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Tue Oct 18 09:12:26 2011
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
SourcePackage: metacity
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (3 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Oliver Gerlich (ogerlich)]

Still occurs in Ubuntu 14.04 beta (with gnome-session-flashback, when starting Metacity-based session).

Would it be possible to apply the metacity patch from the linked Gnome bug report (https://bugzilla.gnome.org/show_bug.cgi?id=687938)?