Using CellMeasurer with scrollToIndex in a list bounces back to scrollToIndex if row is not in CellMeasurerCache

[EmilyHwang]

I'm using CellMeasurer with scrollToIndex set to that last item in the list. I found that with even with the fix in #998, if the user uses the mouse to manually drag the scrollbar all the way to the top then tries to scroll down normally, the list jumps back down to the last item.

After some investigation, it seems that the list jumps to the scrollToIndex value if the row is not in the CellMeasurerCache

[wuweiweiwu]

hi @EmilyHwang that MR was reverted. I'll have to go back and and fix the tests. and push another change out.

[EmilyHwang]

@wuweiweiwu Even with that change (I manually made that fix locally), scrolling does not work properly

[wuweiweiwu]

@EmilyHwang Thanks for verifying. Ill take a look soon

[wuweiweiwu]

@EmilyHwang can you post a simple repro in a codesandbox? that'll be much appreciated