a PostUserEvent of DBTreeListBox::OnResetEntry with a SvTreeListEntry* pEntry as
payload, then the DBTreeListBox is disposed and then the UserEvent arrives and
the, by now deleted, pEntry is processed by the disposed DBTreeListBox

Change-Id: I951639eb633920aa3536cd44320f36f6b2e910aa
Reviewed-on: https://gerrit.libreoffice.org/65514
Tested-by: Jenkins
Tested-by: Xisco Faulí <xiscofauli@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit e9febe48)