ssb: Tried to do the right lit things to prevent unnecessary re-rendering. Ended up doing a lazy JSON thing.

apps/ssb/tf-message.js

@@ -1,4 +1,4 @@
-import {LitElement, html, render, unsafeHTML} from './lit-all.min.js';
+import {LitElement, html, repeat, render, unsafeHTML} from './lit-all.min.js';
 import * as tfrpc from '/static/tfrpc.js';
 import * as tfutils from './tf-utils.js';
 import * as emojis from './emojis.js';
@@ -313,7 +313,9 @@ class TfMessageElement extends LitElement {
 						@click=${() => self.set_expanded(false)}
 					>
 						Collapse</button
-					>${(this.message.child_messages || []).map(
+					>${repeat(
+						this.message.child_messages || [],
+						(x) => x.id,
 						(x) =>
 							html`<tf-message
 								.message=${x}