Recursive use of non-recursive std::mtuex in Scheduler::ProcessTaskScheduling?

[Caolán McNamara]

On Tue, 2021-02-09 at 17:13 +0100, Jan-Marek Glogowski wrote:
> I don't see a way to prevent AnyInput / PeekMessage to process
> messages.

FWIW https://bugs.documentfoundation.org/show_bug.cgi?id=140293 is a
problem MarkHung had this morning under windows which I was able to
reproduce which seems to be the same issue causing initial launch of
the startcenter to fail