Unsent Attachments Aren't Updated

[joshuafhiggins]

When unsending an attachment, either as the recipient or sending, the BlueBubbles Server doesn't broadcast the updated message event that the attachment was deleted. This means that, if the BueBubbles client didn't delete the attachment, unsent attachments aren't removed. If the client didn't download the attachment before it was unsent, then the BB client fails to fetch the attachment. This can be tested by unsending an attachment in iMessage and any clients are not notified of the change. If one client unsends it, then others will not see it removed.

This occurs on the latest release, 1.9.6, even with the new feature to include edit and unsends on the updated message event.