Reduce CSS changes when input is focused #62
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When an input is focused, the requestAnimationFrame check loop should change CSS only when it is necessary.
So instead of repeatedly calling
showPlaceholderIfEmpty()(which callsremoveClass()oraddClass()all the time) in the check loop, we should pollinginput.val()and callhidePlaceholder()orshowPlaceholder()only when the boundary condition is satisfied.