Generic function
Returns the amount of whitespace around the children in a layout.
layout-border layout => border
type-union(
<row-layout>, <column-layout>, <table-layout>, <grid-layout>,
<stack-layout>).
<integer>.
duim-layouts
duim-layouts
Returns the amount of whitespace, in pixels, around the children in layout.
Note that this function does not apply to pinboard layouts, because the positioning of the children in a pinboard layout is completely in the control of the programmer.
layout-border-setter, page 471