Comment # 1 on bug 56428 from Patrick Ohly

Patch pending in branch, will be in master soon:

commit 75710ec2290350b557a97de62a9d5cd0edd4fc3e
Author: Patrick Ohly <patrick.ohly@intel.com>
Date:   Fri Nov 30 14:42:22 2012 +0100

    PIM: ViewAgent.Quiescent() optional (FDO #56428)

    Document the new callback, make it optional and add tests, also for
    the old behavior of "close view when ViewAgent methods return error".