Message ids repeat across accounts, so a hook payload naming only an
emailId could not tell a plugin which mailbox the message lies in when
it is a shared or group account's.
onBeforeEmailStarToggle and onEmailStarToggle now carry accountId when
the starred message is not in the user's own account, as the
message-row-actions click context does. Every star (the row's button,
the reader's star, the key, the menu) goes through toggleStar, one
message at a time, so one accountId names it; the account is resolved
before the plugins are asked. An own message's payload is unchanged.
onAfterEmailSend now carries accountId, the JMAP account the sent
message lies in (a mail sent from a shared or group identity lies in
that account), so api.email.get finds it. sendEmail returns that account
as emailAccountId, the S/MIME send too. The hook also carries
composerId, the id the sending composer's slots and actions gave
plugins, so a plugin can act on what the user chose in that composer.
Jacob Zeitz
Linus Rath