sw_uiwriter hangs in testDateFormFieldCurrentDateInvalidation

[Kaganski Mike]

Hi!

I see sw_uiwriter hanging locally in 
testDateFormFieldCurrentDateInvalidation (added in commit 
d0ff1090762ac61ce08f54bc76685232699d98a0), never returning from 
Scheduler::ProcessEventsToIdle. Killing the test after some time 
produces multiple lines in console:

> warn:vcl.schedule:5488:13820:vcl/source/app/svapp.cxx:470: ProcessEventsToIdle: 1000
> warn:vcl.schedule:5488:13820:vcl/source/app/svapp.cxx:470: ProcessEventsToIdle: 2000
> ...
> warn:vcl.schedule:5488:13820:vcl/source/app/svapp.cxx:470: ProcessEventsToIdle: 845000

I believe that's the reason for massive number of aborted Windows 
jenkins builds that lately affect our CI (just the last few are builds 
#34586, #34587, #34588, #34589, #34590, #34591).

-- 
Best regards,
Mike Kaganski