Support opening a message from a deep-link

[nesium]

As a user I want to send deep-links to my colleagues so that I can point them to selected messages and also do so over different mediums, i.e. via email or bug trackers.

Refs prose-im/prose-pod-system#10

[nesium]

@valeriansaliou I was thinking since message deletion/retraction happens via tombstones, could this be a privacy issue if one has a link to a message? Or even if they only scroll through a conversation and watch the traffic since the (tombstomb) message will be loaded.

[nesium]

Also what would the UI look like since it dictates the API. Obviously we'd need a method to load a message by ID. Would we need to load messages before and after the selected message as well?

[valeriansaliou]

On my end, I don't see any issue loading a message from the middle of an archive, and then scrolling backwards or forwards and loading archives in both directions. The messaging view has already support for "forward" scroll loading. Also, loading spinners can show both in forwards and backwards directions.

[nesium]

Ok, so I understand that you'd want to display the message in the context of the conversation, basically just scrolled to the message. While it's great that the messaging view already supports foward loading, I do not have any idea at the moment how we'd handle this with MAM. This is a major headache since you'd need to load all messages up until now to have an accurate display of a message, i.e. reactions or edits that were added to a message later. A MAM implementation that would perform the message reducing server-side could fix that problem.

[dscso]

#69