fix an issue that _currIndex may be set incorrectly
#8
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When
scrollToIndex()is called to scroll to an item that isn't in viewport, the scrolling may stop at the top or bottom of the list because the target item hasn't been loaded. Then_currIndexwill be set to the target index incorrectly. It may cause some notifications about index change to be ignored.notifyIndexChanged()can set_currIndexto the correct index.