make comphelper::OInterfaceContainerHelper4 more threadsafe

(*) make all the methods that require an external mutex take a
std::unique_lock as a parameter, so that call sites cannot forget

(*) make the forEach method drop the lock when firing listener methods,
to reduce the odds of deadlock

Change-Id: I0a80e3b3d1c1c03b7de4a658d31fcc2847690903
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128415
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

0 files changed, 0 insertions, 0 deletions