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If it's a swipe, onPageScrolled() is called several times before onPageScrollStateChanged(SCROLL_STATE_SETTLING) and onPageSelected().
If it's a click, only onPageScrollStateChanged(SCROLL_STATE_SETTLING) is called before onPageSelected().
And onPageScrollStateChanged(SCROLL_STATE_SETTLING) will not be called if user don't switch to a new tab.
We use the difference to tell if user switching tabs by swiping or clicking.
Test: DialtactsActivityTest
PiperOrigin-RevId: 168403148
Change-Id: Iaaf84ab9c4955d0bc2c1e9857ba59fd37b3984af
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