SSE extension should dispatch close event

[christophenne]

Hi,

I am currently missing a way to listen for SSE close events. I think it would be fair to allow for listing to such events, in order to show some information to the user, for example.

I could imagine the two following ways:

• dispatch an htmx:sseClose event
• dispatch the htmx:sseBeforeMessage and/or htmx:sseMessage event(s), even when the message type equals the sse-close message type.

Please let me know what you prefer or how I could do it instead, thanks!

[Telroshan]

(Cf the PR in progress about that matter #31)

[Telroshan]

Fixed in #31