Run when the scrolling message frame's scroll position changes.
Run when the scrolling message frame's scroll position changes. A ScrollingMessageFrame's scroll position can change not only when it is scrolled, but also when a message is added to the frame; both cases cause this script handler to be run.
Signature:
Code
OnMessageScrollChanged(self)
Arguments:
self - Reference to the widget for which the script was run (scrollingmessageframe)
