Recompute internally what needs be done for the next onDraw.
This function MUST be called before calling onDraw and getDirtyRectangle.
This method exists to allow the Window to recompute these draw lists less.
And because cache invalidation was easier on user code than internally in the UI.
Recompute internally what needs be done for the next onDraw. This function MUST be called before calling onDraw and getDirtyRectangle. This method exists to allow the Window to recompute these draw lists less. And because cache invalidation was easier on user code than internally in the UI.