Does anybody have a nicer solution or workaround this problem? I'm
guessing that the actual problem is due to the invalid region being
non-integer, but I can't quite put my finger on it because (and this
is from a windows software background) I'm drawing both the
background and foreground.
Is your scroll view itself pixel aligned? If it isn't, you can get
these kinds of problems because it will be trying to copy and/or
render partial pixels at the edges of your view when you scroll.
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