Fix `m.receipt`s causing notifications (#2893)

Fixes https://github.com/matrix-org/dendrite/issues/2353

1 files changed, 7 insertions, 0 deletions

diff --git a/syncapi/types/types.go b/syncapi/types/types.go
index 295187ac..9fbadc06 100644
--- a/syncapi/types/types.go
+++ b/syncapi/types/types.go
@@ -480,6 +480,13 @@ func (jr JoinResponse) MarshalJSON() ([]byte, error) {
 	if jr.Ephemeral != nil && len(jr.Ephemeral.Events) == 0 {
 		a.Ephemeral = nil
 	}
+	if jr.Ephemeral != nil {
+		// Remove the room_id from EDUs, as this seems to cause Element Web
+		// to trigger notifications - https://github.com/vector-im/element-web/issues/17263
+		for i := range jr.Ephemeral.Events {
+			jr.Ephemeral.Events[i].RoomID = ""
+		}
+	}
 	if jr.AccountData != nil && len(jr.AccountData.Events) == 0 {
 		a.AccountData = nil
 	}