Frame was correctly formatted until spellchecker comes and
calls GetCharRect which somehow reformats the frame causes the misalignment.

So instead of calling GetCharRect, just call GetPaintArea as the frame is already
formatted at this point.

Change-Id: I31df9140174c40cf4cf39891490301cbe4c5806a
Reviewed-on: https://gerrit.libreoffice.org/68927
Tested-by: Jenkins
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>