Callbacks may be invoked while calling getLOKPayload(), which
would try to lock the mutex again. I actually originally expected
this possibility, as the comment and moving the data to
temporaries in CallbackFlushHandler::enqueueUpdatedTypes()
shows, I just didn't realize the used mutex wasn't recursive
and so would deadlock.
Change-Id: I2b5c4b6b4c1a3933a32ae4641830877e085f2b6c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135499
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
118bafcfd1