Allow "Reply" to create sub-threads

[timbl]

Desktop: A menu at the Right of the message allows, instead of just deleting the message,

• Delete message if allowed for this chat in its prefs.
• Edit message if allowed for this chat in its prefs.
• Reply to message.
• [Hide thread]

The latter creates a new indented message input field under the original message.
When the new message is inserted, it is indented a bit to the right When the new thread is first added, a "Reply to thread" button is added to do the same thing more easily

Also allow a Hide Thread button somewhere. Grey Triangle at left?

RDF model: a link between the two messages, stored in the chat file, or in both chat files if they are in different dated chat files. Ontology to be decided. SIOC? Schema.org?

Model: How Telegram does this. Also look at Reddit and hacker news...

Creating new threads should be an option the creator of the chat can tun off, but default on.

You should be able to open the first message of a thread in the browser and see just the thread below it.

[timbl]

In Matrix, to which we are moving from Gitter, a thread is based on a message in the mainline, and each message the thread has a pointer back to the original root message of the thread. A SIOC property which seems to maybe be appropriate. However the SIOC concept of thread is to have the thread as a container of messages.

"""

Class: sioc:Thread

Thread - A container for a series of threaded discussion Posts or Items.

sub-class-of:	sioc:Container

Class: sioc:Thread Thread - A container for a series of threaded discussion Posts or Items.

sub-class-of: sioc:Container

But maybe the term sioc:reply_of would be the one for the link back to the thread root

Property: sioc:reply_of

reply of - Links to an Item or Post which this Item or Post is a reply to.

Inverse: | sioc:has_reply -- | -- ObjectProperty sioc:related_to sioc:Item sioc:Item
Property: sioc:reply_of reply of - Links to an Item or Post which this Item or Post is a reply to. Inverse: [sioc:has_reply](http://rdfs.org/sioc/spec/#term_has_reply) OWL Type: ObjectProperty sub-property-of: [sioc:related_to](http://rdfs.org/sioc/spec/#term_related_to) Domain: [sioc:Item](http://rdfs.org/sioc/spec/#term_Item) Range: [sioc:Item](http://rdfs.org/sioc/spec/#term_Item)

[timbl]

• [x] Reply button generate new thread in message bar
• [x] Entering new message in thread does the right thing
• [x] find icon for reply button
• [x] Button to show thread replying to this message when there is one
• [x] Space for thread view in 4th column of triptych
• [x] button to close thread view
• [x] Shapes diagram
• [x] Generate threads in Matrix feed
• [x] Fix problem os matrix replacements being different shape
• [x] Thread as first class object in SolidOs panes

Testing issues

• [ ] can't send from thread in same day
• [ ] Check delete message and edit work in thread
• [ ] can't add new message in thread for any previous day
• [ ] error Statement to be removed is not on store: :n174 http://www.w3.org/2007/ont/link#status :175
• [ ] new message UI missing from thread (used to be there)

Future stuff carry forward

• [ ] UX to react with an emoji like in matrix
• [ ] Reply button generate (or reply) in message bar
• [ ] Find or make icon for list threads
• [ ] Find or make icon for reply directly
• [ ] Reply display (copy of replied to message in some form)
• [ ] Markdown
• [ ] List of threads mode in main display
• [ ] Imposter issue

[timbl]

An open question is how to represent in RDF that a message is what in IRC is a /me message which displays like [timbl looks around], and which Matrix calls a m.emote

[TallTed]

It is perhaps worth nothing that IRC display varies with clients. My client (Snak.app on macOS) displays the /me messages as

hh:mm:ss    * timbl | looks around

vs a chat message that looks like

hh:mm:ss    <timbl> | An open question...

Also, that IRC has allowed users to emote for decades. Matrix's "innovation" is just to prefix it with m.

[timbl]

See solid-ui PR https://github.com/SolidOS/solid-ui/pull/531 ... still testing