to use font height in different DrawXXX methods + I have to use the full item height,
otherwise (as soon as FontAscent is smaller then FontHeight and smaller than image(s) height,
outline, highlight, text - everything is misplaced).


git-svn-id: http://root.cern.ch/svn/root/trunk@46959 27541ba8-7e3a-0410-8455-c3a389f83636