But according to the docs, this can sometimes get called in cases where
the user didn't actually scroll (e.g. the view was resized or
something). I need to know that it was a user-initiated scrolling action.
In the past, I cheated and made an NSTimer which polled the scroll bar
position, but I'm thinking there's got to be a cleaner way than that.
I am wondering if it would be safe to change the target and action on
the NSScrollView's scrollers to point to a custom selector of mine
(which would call through to the original action before doing my extra
work). Technically this is fraught with peril because the NSScrollView
could change the target/action back at any time, but I am thinking that
pragmatically this is unlikely to actually occur.
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