Updates the scroll frame's scroll child rectangle.
You were required to call this when you changed the contents of your ScrollFrame prior to patch 2.3. You no longer need to call it now. If a child frame, texture or fontstring has changed, the scroll parent will automatically recalculate it's scroll rect and dispatch events appropriately.
You do need to call it before calling your own :SetVerticalScroll() to flush pending updates (for instance after you inserted text in the scrolling edit box)
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