redraw whenever content changes #2
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I believe that TriangleLabelView needs to explicitly invalidate and request a new layout whenever content changes.
In version 1.0.0 it does not do this and it can result in this problem if a user scrolls back and forth (the numbers in the center of each square should match the number in the TriangleLabelView but they do not)
In this PR every time a property of the view changes the content is invalidated and a new layout is requested. (See https://developer.android.com/training/custom-views/create-view.html#addprop for more information)
Thanks for the great library!