The canvas key did not change when a plug-in was installed, replaced or
removed, so the canvas kept showing the frame drawn with the old plug-in,
and a pan by whole pixels copied that frame's pixels next to strips drawn
with the new one.
The key now carries the plug-in revision of the last install or removal
after which the document draws a plug-in effect, in its layers, in a
symbol's or pattern's art, or in a brush's art. The canvas looks through a
document once after each install or removal; a document without a plug-in
effect keeps its key.
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