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The change of the form of grace notes is a typical mannerism of Fontana. In this case, the Chopinesque grace note in the form of a small crotchet is almost certainly an appoggiatura, hence replacing it with a slashed quaver is contrary to Chopin's intention. Possible performing manners with arpeggio:
or 
.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Fontana's revisions
notation: Ornaments