Replying to a message containing "@room" trigger noisy notification

[bmarty]

Steps:

• A message containing "@room" is sent to a room
• A moderator reply to this message

Current behaviour:

• the moderator reply triggers a highlight notification because the message contains "@room" (from the previous message)

Expected behaviour:

• the highlight notification should only occurs if "@room" is in the reply itself

[auscompgeek]

Related: element-hq/element-web#7874

[lieuwex]

dup: #6202
related: https://github.com/matrix-org/matrix-doc/issues/2736

Again, just stripping the fallback before applying the push rules would fix this. If combined with matrix-org/matrix-spec-proposals#2463 it should fix most (if not all) unwanted highlight problems.

[richvdh]

as @lieuwex says, this is a dup of #6202 and an artifact of matrix-org/matrix-doc#2736. I don't think there's anything to be done on the synapse side for now: it's something we can look to sort out as part of the notifcations rework