sure all messages that could trigger an update have
actually arrived at the server
* small clean ups here and there, some clarifications in
comments
* check for the return value of Lock() in DisableUpdates()
and EnableUpdates()
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17158 a95241bf-73f2-0310-859d-f6bbb57e9c96