The code-path in SfxMedium and lower layers is the same, but not in
SfxObjectShell.

(cherry picked from commit e90a16d7)

Conflicts:
	sfx2/sdi/sfx.sdi
	sfx2/source/doc/guisaveas.cxx

Change-Id: I85542d17cd6b3c2a0d257f5ff196e6504a194e51
Reviewed-on: https://gerrit.libreoffice.org/47980Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>