rustfmt indents leading section comments to match code indentation, breaking intentional left-aligned vertical alignment

rustfmt indents leading section comments to match code indentation, breaking intentional left-aligned vertical alignment

            .with_quic_config(|mut cfg| {
                // ===== Connection Lifespan =====
                cfg.keep_alive_interval = Duration::from_secs(5);
                cfg.max_idle_timeout = 30_000; // ms (30 seconds)
                // ===== Concurrent Stream Limit (QUIC Layer) =====
                cfg.max_concurrent_stream_limit = 10_000;
                // ===== Flow Control =====
                cfg.max_stream_data = 100 * 1024;
                cfg.max_connection_data = 20 * 1024;
                // ===== Protocol Compatibility =====
                cfg.support_draft_29 = true;
                cfg
            })

After running cargo fmt, the comments are indented to match the surrounding code block:

            .with_quic_config(|mut cfg| {
                // ===== Connection Lifespan =====
                cfg.keep_alive_interval = Duration::from_secs(5);
                cfg.max_idle_timeout = 30_000; // ms (30 seconds)
                                               // ===== Concurrent Stream Limit (QUIC Layer) =====
                cfg.max_concurrent_stream_limit = 100;
                // ===== Flow Control =====
                cfg.max_stream_data = 100 * 1024;
                cfg.max_connection_data = 20 * 1024;
                // ===== Protocol Compatibility =====
                cfg.support_draft_29 = true;
                cfg
            })

// ==== Concurrent Stream Limit (QUIC Layer) ==== is not left-aligned

can you optimize this problem?

Start by reproducing the reported formatting change with cargo fmt using the Rust snippet in the issue. Trace how rustfmt handles the leading section comment after the inline comment, then add coverage for this case if the relevant test location is found. Done means cargo fmt preserves the comment’s intended left alignment without changing other formatting.