Line break before operator added only with --experimental-string-processing

[Zac-HD]

Running Black on the following code makes no changes:

(
    "whatever" == "a very long string broken across two lines.  "
    "If you put this on one line it would be too long."
)

unless you add --experimental-string-processing, in which case a newline is added before ==:

(
    "whatever"
    == "a very long string broken across two lines.  "
    "If you put this on one line it would be too long."
)

I don't have a strong view on which is better, but they should probably be consistent. Related to #2188.

[DanielNoord]

Is the placement of the operator on the second line intentional? Currently this makes --experimental-string-processing incompatible with main, as it wants to put the operator + compared value back on the first line.

Personally I think operator on the same line is more readable, but I guess this is just a stylistic change I'll need to get used to. Either way, placement of the operator is probably something that should be consistent on main and --experimental-string-processing right?