set scrollbar parameters anyway, it is nesessary for mouse wheel handling
set scrollbar parameters anyway, it is nesessary for mouse wheel handling

otherwise there is a bug:
in Writer's page preview mode scrolling can move the selection out of page range
if all pages fit into the window

(regression from d7b06ba7ec2c988e80c8ef14e2d9bfc2c29e2d24)

Change-Id: I6cebf0c5a4f944cfb8736469620b3097df0a0340

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core