remember any room avatars set on matrix-side

matrix/api.js

@@ -167,6 +167,8 @@ async function profileSetAvatarUrl(mxid, avatar_url) {
  * @param {number} power
  */
 async function setUserPower(roomID, mxid, power) {
+	assert(roomID[0] === "!")
+	assert(mxid[0] === "@")
 	// Yes it's this hard https://github.com/matrix-org/matrix-appservice-bridge/blob/2334b0bae28a285a767fe7244dad59f5a5963037/src/components/intent.ts#L352
 	const powerLevels = await getStateEvent(roomID, "m.room.power_levels", "")
 	const users = powerLevels.users || {}

matrix/kstate.js

@@ -42,6 +42,7 @@ function diffKState(actual, target) {
 	const diff = {}
 	// go through each key that it should have
 	for (const key of Object.keys(target)) {
+		if (!key.includes("/")) throw new Error(`target kstate's key "${key}" does not contain a slash separator; if a blank state_key was intended, add a trailing slash to the kstate key.`)
 		if (key in actual) {
 			// diff
 			try {