Avoid antialiasing for drag rect
Avoid antialiasing for drag rect

Fix for fdo#31860 - slide dragging gets horrendously slow on Linux,
due to excessive antialiased repaints. Visual difference: zero, no
sub-pixel coordinates used.

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