滑动到最后一项点击最后一项会默认滑动到倒数第二项，

除了第一项在选中状态时点击不滑动之外，其他几项点击都会滑动到上一项

Start by reproducing the picker behavior described in the issue: select the last item, click it, and compare the result with clicking other selected items. Trace the Android picker or wheel-selection entry point that handles clicks and scrolling. Done means clicking an already selected item does not unexpectedly move to the previous item, while the first-item behavior remains unchanged.

Written by the indexing model from the issue text.