Evaluating a layer's Pathfinder or geometry effects asked each member
whether a sublayer below it held a ruler guide, then asked the members
of every selected sublayer or group the same question again on the way
down. A sublayer nested N deep was scanned once per layer or group above
it, so a chain of N sublayers cost N(N+1)/2 scans.
One read walk now looks at each member once at most and records which
members hold or lead to a sublayer's guides, and the move visits and
copies only those. As before, the groups inside a sublayer that holds no
guide are not looked into. The guides taken, their order, their hidden
and locked state, the art left behind and the sharing of untouched
members are the same as before.
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