The form of this adverb used by Chopin had already been archaic in his time. Therefore, in the main text we accept the correction introduced in GE1. The form used in FE is erroneous, whereas in EE the adverb was replaced with an adjective. Curiously, GE2 reinstated the incorrect A form.
Similarly in bar 317.
NB. The contemporary Italian orthography approves of leggero, leggeremente only, without 'i'. However, the older orthography is traditionally used in music markings and is not deemed erroneous.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, GE revisions, FE revisions
notation: Verbal indications