The problem here is that when switching to the print preview, there are
2 view shells, SwEditShell::UpdateTable() is called and the first one
does some layouting in ImplEndAction(); this creates a11y events for the
2nd print preview one (see loops in SwViewShellImp::Invalidate*) and
stores them in the SwAccessibleMap since there is an Action going on;
then SwViewShell::ImplEndAction() for the print preview shell is called
but it returns early without sending out the events, so they remain
until the ~SwAccessibleMap asserts about them.

Change-Id: Ie1c6b82fc5f2cdb2998d514a632295ad07e97517