Mermaid: sequence diagram request: grouping actors in box

[The-Alchemist]

Request Description

I'd love to be able to do this:

More specifically, the "boxes" labeled "Application" and "Kafka".

Source: https://chrzaszcz.dev/2019/12/kafka-transactions/

Proposed Syntax

I propose using the same syntax as loops:

    participant Alice
    participant Bob


    box Alice_and_Bob
    Alice->>Bob: Hello John, how are you?
    Bob->>Alice: Fight against hypochondria
    end

[knsv]

Thats a good idea! We should do this.

[cmmoran]

Agreed. I can probably get this implemented.

soon™

[The-Alchemist]

Agreed. I can probably get this implemented.

soon™

You're awesome, @cmmoran ! I volunteer to test.

[eclaus]

If the participants belong to a single box, the box could be set when creating the participants.
For example:

sequenceDiagram
    %% Alice and Bob are grouped in "Alice_and_Bob" box
    box Alice_and_Bob
    participant Alice
    participant Bob
    end
    %% Truddy does not belong to a group
    participant Truddy