From Otto Schaile: Solve bug: https://savannah.cern.ch/bugs/?43081 If a TCanvas has a vertical scrollbar scrolling downwards works  as expected. Upwards jumps to the top of the canvas.
From Otto Schaile:
Solve bug: https://savannah.cern.ch/bugs/?43081
If a TCanvas has a vertical scrollbar scrolling downwards works 
as expected. Upwards jumps to the top of the canvas.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@25891 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT