add fallback reply for poll start (matrix-org#10380)

Author: Kerry

src/utils/Reply.ts

@@ -21,7 +21,8 @@ import escapeHtml from "escape-html";
 import { THREAD_RELATION_TYPE } from "matrix-js-sdk/src/models/thread";
 import { MsgType } from "matrix-js-sdk/src/@types/event";
 import { M_BEACON_INFO } from "matrix-js-sdk/src/@types/beacon";
-import { M_POLL_END } from "matrix-js-sdk/src/@types/polls";
+import { M_POLL_END, M_POLL_START } from "matrix-js-sdk/src/@types/polls";
+import { PollStartEvent } from "matrix-js-sdk/src/extensible_events_v1/PollStartEvent";
 
 import { PERMITTED_URL_SCHEMES } from "../HtmlUtils";
 import { makeUserPermalink, RoomPermalinkCreator } from "./permalinks/Permalinks";
@@ -112,6 +113,16 @@ export function getNestedReplyText(
         };
     }
 
+    if (M_POLL_START.matches(ev.getType())) {
+        const extensibleEvent = ev.unstableExtensibleEvent as PollStartEvent;
+        const question = extensibleEvent?.question?.text;
+        return {
+            html:
+                `<mx-reply><blockquote><a href="${evLink}">In reply to</a> <a href="${userLink}">${mxid}</a>` +
+                `<br>Poll: ${question}</blockquote></mx-reply>`,
+            body: `> <${mxid}> started poll: ${question}\n\n`,
+        };
+    }
     if (M_POLL_END.matches(ev.getType())) {
         return {
             html:

test/Reply-test.ts

@@ -26,7 +26,7 @@ import {
     stripHTMLReply,
     stripPlainReply,
 } from "../src/utils/Reply";
-import { mkEvent } from "./test-utils";
+import { makePollStartEvent, mkEvent } from "./test-utils";
 import { RoomPermalinkCreator } from "../src/utils/permalinks/Permalinks";
 
 function makeTestEvent(type: string, content: IContent): MatrixEvent {
@@ -160,6 +160,12 @@ But this is not
 
             expect(getNestedReplyText(event, mockPermalinkGenerator)).toMatchSnapshot();
         });
+
+        it("should create the expected fallback text for poll start events", () => {
+            const event = makePollStartEvent("Will this test pass?", "@user:server.org");
+
+            expect(getNestedReplyText(event, mockPermalinkGenerator)).toMatchSnapshot();
+        });
     });
 
     describe("shouldDisplayReply", () => {

test/__snapshots__/Reply-test.ts.snap

@@ -53,3 +53,12 @@ exports[`Reply getNestedReplyText should create the expected fallback text for p
   "html": "<mx-reply><blockquote><a href="$$permalink$$">In reply to</a> <a href="https://matrix.to/#/@user1:server">@user1:server</a><br>Ended poll</blockquote></mx-reply>",
 }
 `;
+
+exports[`Reply getNestedReplyText should create the expected fallback text for poll start events 1`] = `
+{
+  "body": "> <@user:server.org> started poll: Will this test pass?
+
+",
+  "html": "<mx-reply><blockquote><a href="$$permalink$$">In reply to</a> <a href="https://matrix.to/#/@user:server.org">@user:server.org</a><br>Poll: Will this test pass?</blockquote></mx-reply>",
+}
+`;