Feature Request: Vertical semicolon when wrapping function chains

I ended up writing this feature request formatted like the Rustfmt options docs. Please let me know if more information is needed or if I somehow missed that this option already exists.

fn_chain_vertical_semicolon

Vertically wrap the semicolon at the end of a vertical function chain.

Pros

• Easier to visually scan the leftmost character to see when the method calls stop and the semicolon ends the statement.
• IDEs that support single-line commenting don't have to be corrected after commenting out the last line.
  • e.g. in the false example, an IDE may replace .dolor(); with // .dolor(); and comment out the semicolon causing an error.

Cons

• Adds a basically empty line, making code taller than necessary.

• Default: I don't know how this is decided. As it is currently unimplemented, the default is false.
• Possible Values: true, false

false:

fn main() {
    lorem
        .ipsum()
        .dolor();
}

true:

fn main() {
    lorem
        .ipsum()
        .dolor()
        ;
}

No implementation files or tests are named. Start by locating rustfmt's handling of vertically wrapped function chains and its option-definition and documentation paths, then compare the current and requested examples. Done means the option is defined, documented, applied to the chain layout, and covered by formatter tests for both values.