Missing rows with mdVirtualRepeat

[nikdj]

Here's the code pen link: https://codepen.io/anon/pen/yjEwJb?editors=1010

The total number of row, like mentioned in the toolbar, is 36. However, only 32 are viewable using the scroll bar, as can be verified by the row index column.

Moreover, when you try to slowly scroll, you will notice that for a first few pixels no scrolling happens even if the scroll bar moves. I think this is the root of the bug.