scrollIntoView improvements

[dvmoritzschoefl]

It would be great if the API would let me control how scrollIntoView works and is used.

User story
Currently when the API for scrolling to a specific row index is used, the HTMLElements scrollIntoView(true) is called. This is often times not sufficient, for example when

• I want to control the parameters for scrollIntoView (smooth scrolling, block: 'nearest', etc...)
• I want to not apply scrollIntoView at all, but use a scrollTop = ... calculation

Nice would be 2 seperate functions:

• scrollIntoRow(indices, options) (calls scrollIntoView with the options)
• setHorizontalScroll/setVerticalScroll in conjunction with getScrollOffset(rowIndex) (sets the scrollTop, scrollLeft property correctly)