Improve 'resize with cell'

[Regina Henschel]

Hi all,

I want to change the way 'resize with cell' is handled, because the 
current way causes a lot of bugs. My intended patch is in 
https://gerrit.libreoffice.org/c/core/+/104643

A review would be nice. Especially
- Do you agree with the changes in principle?
- Do you see any problem, which I need to solve before merging the patch?

The patch has no unit tests. I will write unit tests as separate commit 
afterwards.

Kind regards
Regina