There is no 
before the top most note of the chord in bar 79 in A (→GE1op), necessary before g
1 due to the notation in the four-flat key signature. The sign was added in the remaining GE. In bar 80, Chopin did not write a 
before the lowest note of the last chord in A. The sign, although only cautionary in this context, is undoubtedly justified in this place and it was added in GE.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: GE revisions, Omission of current key accidentals, Inaccuracies in A
notation: Pitch