localClipRegion was just set but never used, when KDE4 xlib
blitting was replaced by Cairo / QPainter blitting. So this
converts all the occurences to apply these clippings to the
drawing QPainter instance.

Change-Id: Ibfd60049ce604ac1415dc5c602ed5c952f972891
Reviewed-on: https://gerrit.libreoffice.org/70006
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>