RoosterDragon 087b407f46 Avoid ScrollPanelWidget drawing invisible child items. ...

If child items in a scroll panel will be outside the scissor area, then we can avoid drawing them at all. If a scroll panel has many items, this reduces to the draw cost closer to those visible in the panel, rather than costing for all the items.

2015-04-25 18:55:47 +01:00

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