Extra indentation on line that starts with dot and previous line is close parenthesis.

[daniel-wong-dfinity-org]

rustfmt wants indentation like this:

foo(
    // Whatnot
    42,
)
.bar() // Same amount of indentation on this line as the previous line with close parenthesis.

but rust-mode does this:

foo(
    // Whatnot
    42,
)
    .bar()  // Extra indentation.