One 
sign in FE indicates that two signs in GC (separated with a transition to a new line) are to be interpreted as a continuous . The notation of GE is certainly arbitrary – erroneous or revised. In GC and GE the dashes marking the range of crescendo from bar 217 are led to the beginning of the hairpin, in spite of the fact that in each of these sources the signs start in another place.
Due to the relation of the hairpin with the preceding it cresc. - -, which was overlooked in FE, in the main text we give the ending of the dashes and the hairpin on the basis of GC. According to us, however, the slightly earlier started sign in FE (→EE) reproduced Chopin's notation probably in a more accurate manner.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Inaccuracies in GE, Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins