Scrollbar prototype + fixed scrolling direction issue
Scrollbar prototype + fixed scrolling direction issue

Also fixed sensitive area issue #35

zhanghuijun-hello/test,zhanghuijun-hello/test,zhanghuijun-hello/test,VCG/upset,syrenio/upset,XDATA-Year-3/UpSet,VCG/upset,XDATA-Year-3/UpSet,zhanghuijun-hello/test,XDATA-Year-3/UpSet,syrenio/powerset,VCG/upset,XDATA-Year-3/UpSet,syrenio/upset,syrenio/powerset,XDATA-Year-3/UpSet,syrenio/upset,syrenio/upset,syrenio/powerset,VCG/upset,syrenio/powerset