- The main advantage of avoiding font change and
use join members is that part of the border can be
removed (e.g. right or left border) but shadow won't.
- Other advantage, SwTxtSizeInfo is used for calculate
the length of the specified string and there are some
case when this length have to exclude the border width.
- Add join members to SwDropPortionPart and use these
members to set the whole drop portion's same member.
In general a drop portion' join members are false
and it get true value only temporarly during the actual
part formatting. (maybe it would be better solution to
make distinct drop portions instead of parts)
- Improve line break

Change-Id: I6d11ec7b250c9a8b769cffaf83861f25f0c477a5