message: given we also want to hide widget events, hide all except m.room.message
diff: @@ -68,9 +68,8 @@ const FilePanel = React.createClass({
  "room": {
  "timeline": {
  "contains_url": true,
  - "not_types": [
  - "m.room.avatar",
  - "m.sticker",
  + "types": [
  + "m.room.message",
  ],
  },
  },
  