(regression from 0377b99b)

* divide PART_SEPARATOR into PART_SEPARATOR_HORZ and PART_SEPARATOR_VERT
* improve separator reduction: now the offset is (height*0.2) instead of 7.
* rename: gVSeparator -> gSeparator
* remove trailing whitespace

Change-Id: I I If144509d7e061bf1b7901cd5418c4d7dbc3aa0d0