fix gap failing to fill 2nd time + unit regression test

src/domain/session/room/timeline/tiles/GapTile.js

@@ -72,3 +72,31 @@ export class GapTile extends SimpleTile {
         return null;
     }
 }
+
+import {FragmentBoundaryEntry} from "../../../../../matrix/room/timeline/entries/FragmentBoundaryEntry.js";
+export function tests() {
+    return {
+        "uses updated token to fill": async assert => {
+            let currentToken = 5;
+            const fragment = {
+                id: 0,
+                previousToken: currentToken,
+                roomId: "!abc"
+            };
+            const room = {
+                async fillGap(entry) {
+                    console.log(entry.token, currentToken);
+                    assert.equal(entry.token, currentToken);
+                    currentToken += 1;
+                    const newEntry = entry.withUpdatedFragment(Object.assign({}, fragment, {previousToken: currentToken}));
+                    tile.updateEntry(newEntry);
+                }
+            };
+            const tile = new GapTile({entry: new FragmentBoundaryEntry(fragment, true), room});
+            await tile.fill();
+            await tile.fill();
+            await tile.fill();
+            assert.equal(currentToken, 8);
+        }
+    }
+}

src/domain/session/room/timeline/tiles/SimpleTile.js

@@ -85,7 +85,7 @@ export class SimpleTile extends ViewModel {
     // update received for already included (falls within sort keys) entry
     updateEntry(entry, param) {
         const renderedAsRedacted = this.shape === "redacted";
-        if (entry.isRedacted !== renderedAsRedacted) {
+        if (!entry.isGap && entry.isRedacted !== renderedAsRedacted) {
             // recreate the tile if the entry becomes redacted
             return UpdateAction.Replace("shape");
         } else {