[Bug 28473] Freeze when moving between workspaces

[Don Scorgie]

Public bug reported:
https://launchpad.net/malone/bugs/28473

Affects: metacity (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
When switching between workspaces, the desktop occasionally freezes for
a second or 2, leaving everything in a half-drawn state (window outlines
are drawn, but the contents are grey).

While frozen, the mouse is still responsive (I think, its tricky to test
properly).

After a small delay, everything returns to normal and the windows finish
drawing themselves.

This is running Dapper.  I can't reproduce this in Breezy.