SWidget::InvalidateChildRemovedFromTree

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Description

Called when a child is removed from the tree parent's widget tree either by removing it from a slot. This can also be called manually if you've got some non-slot based what of no longer reporting children An example of a widget that needs manual calling is SWidgetSwitcher. It keeps all its children but only arranges and paints a single "active" one. Once a child becomes inactive, its cached data should be removed.

void InvalidateChildRemovedFromTree  
(  
    SWidget & Child  
)  
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