通过 javascript 隐藏来自 discord 用户的消息 - 软阻止

Question

Blocking a user is a good feature of discord, but often enough I find myself wanting to block someone temporarily: not see their messages, but only for a certain period of time and without them knowing that I did so. Theoretically such a thing should be possible to do. I found a userscript that you are supposed to paste into the discord console once you start discord that serves the purpose of hiding messages from blocked users completely. Using the same principle, if instead of searching for blocked messages I could search for messages from a specific user, and then hide them, I could soft-block them for the duration of my current session. So the idea of this is to search all messages in a channel, check if a message was posted by a certain user that I want blocked, and if so, hide it.

To do so I have to figure out how to tie messages to their authors. There appears to be a different class for each new message that a user sends. But when a user sends multiple messages in a row, the classes are different. The first message contains the link to the user's avatar, which in turn contains the user's unique discord ID that he could be identified with. But his follow-up messages don't contain his avatar. And I can't find anything else that I could use to identify a user with except for that.

In the image above the classes that have groupStart contain the avatar links, whereas the classes without it are the follow-up messages from the same user that do not. Like so:

What kind of a loop would be able to include both the messages with some specified avatar, and the follow up messages without it?