Otherwise the following can happen:

- view #0 is created
- view #1 is created
- view #1 changes part, so lok_doc_view_reset_view() gets called
- view #1 calls postMouseEvent(), but claims it happened on view #0

Also log all setView() calls in the widget.

Change-Id: Iefcf82d9396b2af75586e79dde59998320f41d60
Reviewed-on: https://gerrit.libreoffice.org/26245Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>