Step by Step holds the frame after Play, so the first step's result is drawn before the
second step runs, also when the panel's Play button runs after the canvas drew.
An action step recorded as command.batch (an action played while recording, including one
playing at Step by Step or Pause For, or a panel operation that runs as one batch) now plays
as its own steps in Play and Batch..., instead of failing with "batches cannot nest".
dotCooCoo
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