In case the right margin is larger then the tab position (e.g. the right
margin of 7cm, there is a tab position at 16cm and right margin begins
at 9cm), we have a conflicting case.  In Word, the tab has priority, so
in this conflicting case, the text can be outside the specified margin.
In Writer, the right margin has priority. Add a compat flag to let
the tab have priority in Writer as well for Word formats.

This is similar to TabOverflow, but that was only applied to left tabs
and only in case there were no characters after the tabs in the
paragraph.