Edit models often draw the picture a few pixels to the side or a little
zoomed in, so the edges of the paint in Erase show a step. A new ALIGN
button in Erase's tool row measures B against A the way Realign to
Source does and swaps in B moved back over A. Save and Copy use the
lined-up B, and a second click puts B back as it came.
The new route takes only the run's pair key, reads the two previews the
node made, and writes the lined-up B beside them in the temp folder.
ausboss
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