Sub-threads

[tobiasBora]

Your use case

What would you like to do?

I would like to be able to create multiple subthread from a thread. The thread view could list a tree of thread instead of a list, and when a new message is posted in a subthread, a small notification like A new message has been posted in thread XXX could be written in the parent threads (see also #322 when the particular case is for the main room).

Why would you like to do it?

Say in a thread, I have two independent questions/topics that I'd like to talk about, that are related to the current thread, then I'd like to be able to create two sub-threads, one per question. Compare:

- Thread 1:
Alice: Hello, my computer does not turn on.
Bob: Have you tried to plug your computer?
Bob: And do you have a plug with current?
Alice: To plug the computer, can I use an adaptateur US->Europe?.
Alice: How can I test if the plug has current?
Bob: Sure
Bob: Try to plug a lamp in place of the computer.

with

- Thread 1:
Alice: Hello, my computer does not turn on.
- Thread 1.1:
  Bob: Have you tried to plug your computer?
  Alice: To plug the computer, can I use an adaptateur US->Europe?.
  Bob: Sure
- Thread 2.2
  Bob: And do you have a plug with current?
  Alice: How can I test if the plug has current?
  Bob: Try to plug a lamp in place of the computer.

How would you like to achieve it?

Similarly to how threads are already implemented. Except that the construction is recursive, meaning that the list of threads is now a tree.

Have you considered any alternatives?

Not using threading, and getting hard to follow conversations.

Additional context

No response