tdf#40091 Vertical writing inferior to MS Word
tdf#40335 Using Right-to-left (vertical) for text, the characters
overlap each other. Cursor is placed at the half of the character.

It seems that current implementation use HarfBuzz OpenType layout
API hb_buffer_get_glyph_positions() to layout the text, however
instead of setting text direction to HB_DIRECTION_TTB, it
uses HB_DIRECTION_LTR as its direction and rotates each CJK glyph
to simulate the HB_DIRECTION_TTB. However the API use font width
to position each glyph no matter whether the glyph will be rotated
or not.

Change-Id: Ie35238dd92218f8c4463c0ae1d356ad8609c5f48
Reviewed-on: https://gerrit.libreoffice.org/17774Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/18878Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit a4532151)