Like the other similar attributes and methods added lately, they just forward to the corresponding attributes of the "active window". Whether setting and retrieving such then actually does something useful or not I don't know. My main concern is that Automation and COM clients at least won't complain and abort because of unimplemented APIs.
fe1438c1bee0 Add window geometry attributes, too, to ooo.vba.word.XApplication
oovbaapi/ooo/vba/word/XApplication.idl | 4 +++
sw/source/ui/vba/vbaapplication.cxx | 48 ++++++++++++++++++++++++++++++++++
sw/source/ui/vba/vbaapplication.hxx | 8 ++++++
3 files changed, 60 insertions(+)