Autocompletion seems to work with &@ prefixes so it might be something to do with ! or ~

A link with a single slash before a name often means a channel, unless isuser is added like in gamja. In order to maintain compatibility with older links both hash-prefixed and unprefixed links should work.

One of the issues I see with a "per-channel link preview disable" is that

1. it would require a clunky settings UI with a toggle per channel (and gamja doesn't currently have settings per-channel, so this would be a lot of work; and
2. there would be no way to "persist" this information. Without some complicated metadata shenanigans a mostly thin-client like gamja would lose these settings if hard-refreshed.

So imo these "settings" either have to be stored in METADATA or it should be a property of the message

hmm, so you want link previews in some channels but not others?

I was thinking that (similar to something like slack) link-filled channels would make sense with cards. If you didn't want a card then you would have to disable it for that message.

Would it make sense to have something like a client tag +no-preview which can be attached to messages with link previews disabled?

erm.... "revealed" apologies for the typo but I don't really know how to edit

What about supporting draft/multiline or draft/multiline-concat ?

Link previews that operate like in goguma would be a nice quality of life feature in gamja.

Currently colors are completely unsupported in "rich text" mode. However, some color formatting has semantic meaning. One such example is spoilers where the background and foreground are the same color. When clicked the spoiler text should be shown.

Media should be de-duplicated based on content (per-user, for security concerns), in case it is accidentally uploaded multiple times.

Consider an irc channel with three (non-gamja) users: foo @bar and !~@baz.

Auto-completion works for the first two nicks, but not the last.