Taking into account the versions of FE and GC, one may assume that the slur of GC at the end of b. 157 could have been added by Chopin. The aim of that change was undoubtedly a slur encompassing the entire three-quaver motif (as it is 4 bars earlier), which was guessed in EE (the correction could have even been introduced by Chopin in the Stichvorlage for EE). GE reproduced the notation of GC literally, i.e. as coinciding slurs.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Inaccuracies in FE, Embracing slurs, EE inaccuracies, Authentic corrections in GC, Uncertain slur continuation
notation: Slurs