format_code_in_doc_comments adds trailing whitespace on the leading empty line

[stepancheg]

Input (no trailing whitespaces anywhere):

/// Hi
///
/// ```text
///
/// rrr
///
/// xxx
/// ```
fn foo() {
}

rustfmt +nightly --config format_code_in_doc_comments=true

outputs:

/// Hi
///
/// ```text
///<WHITESPACE>
/// rrr
///
/// xxx
/// ```
fn foo() {}

Note whitespace is inserted only on the first empty line.

rustfmt 1.7.0-nightly (ca663b06 2024-01-08)

[ytmimi]

Thanks for the report. Linking the tracking issue for format_code_in_doc_comments (#3348)