#i125020# fix the calculation of the text-update rectangle in CoreText

by doing the calculation before CTLineDraw() updates the text position.
Requesting the update early is possible because that update region is
not used until AquaSalInstance::Yield().


git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1599169 13f79535-47bb-0310-9956-ffa450edef68