Adam Barth c40b92b910 Material should unconditionally repaint on LayoutChangedNotification (#8107)
When a ListView scrolls, it generates a LayoutChangedNotification, which was
causing Material to repaint unconditionally. That's not necessary if there are
no ink effects that need to be moved. This patch skips the repaint in that
case.

Fixes #7937
2017-02-13 15:10:05 -08:00
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