blur
Softens everything inside it, by radius: the component's content, its border and its children.
The blur fades into transparency around the content, and its falloff takes paint outsets. A Foundation container grows the component's bounds by them while its layout bounds stay; any other parent clips what is painted past the bounds. paintOutsets(PaintOutsets.None) gives them layout space under either. A clip declared before this can still cut the halo.
Return
this chain with the blur declared on it.
Parameters
radius
how far each pixel is spread, in the component's own units; 0 or less softens nothing.