Qt Quick ScrollView: Scrollbar jumps in case of list delegates with different height

I've attached application ScrollBarIssues

It is very simple:
1) ScrollView with ListView based on StringList model
2) model contains numbers 1-2000
3) ListView delegate draws rectangle with height calculated as

200 - modelData%200

So line height is various in range 0-200

When I drag the scrollbar, it starts to jump(See attached Scrollbarjumps.mp4)

I've tried on Windows and OS X