Option to mark all messages in a channel as 'read'

[raboof]

Your use case

What would you like to do?

When a channel has many 'unread' messages, I would like to mark the entire channel as 'read'. This works fine with the 'mark all as read' 'little cross' in the top-right for 'regular' messages, but this doesn't clear unread messages that are inside of threads.

Why would you like to do it?

To get back to 0 unread-message markers without having to separately open all threads with unread messages.

How would you like to achieve it?

I think it would make sense if the 'mark all as read' button would be shown also if there are unread messages in threads, and also mark those as read.

Have you considered any alternatives?

No response

Additional context

This is a duplicate of #1042 which was closed because this issue was supposedly "already fixed on develop and will be fixed in the next release", however there have been many releases since and the behavior is still the same. Most recently tested on version 1.11.40.

[t3chguy]