With the Spread... command, the highlighted node is a focal point
about which objects move.
A dialog is presented in which an amount and a direction (up,
down, left, or right) are specified.
An infinite line is passed through the highlighted node's center
and everything above, below, to the left of, or to the right of the
line is moved by the specified amount.
Negative spread distances compact the circuit.
Note that the default unit for typed values is lambda, unless another
unit is explicitly mentioned (for more on lambda, see
section 7-2).
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