Render reason for invite rejection.

src/TextForEvent.tsx

@@ -190,7 +190,10 @@ function textForMemberEvent(
         case KnownMembership.Leave:
             if (ev.getSender() === ev.getStateKey()) {
                 if (prevContent.membership === KnownMembership.Invite) {
-                    return () => _t("timeline|m.room.member|reject_invite", { targetName });
+                    return () =>
+                        reason
+                            ? _t("timeline|m.room.member|reject_invite_reason", { targetName, reason })
+                            : _t("timeline|m.room.member|reject_invite", { targetName });
                 } else {
                     return () =>
                         reason

src/i18n/strings/en_EN.json

@@ -3455,6 +3455,7 @@
             "left_reason": "%(targetName)s left the room: %(reason)s",
             "no_change": "%(senderName)s made no change",
             "reject_invite": "%(targetName)s rejected the invitation",
+            "reject_invite_reason": "%(targetName)s rejected the invitation: %(reason)s",
             "remove_avatar": "%(senderName)s removed their profile picture",
             "remove_name": "%(senderName)s removed their display name (%(oldDisplayName)s)",
             "set_avatar": "%(senderName)s set a profile picture",

test/unit-tests/TextForEvent-test.ts

@@ -518,6 +518,49 @@ describe("TextForEvent", () => {
                 ),
             ).toMatchInlineSnapshot(`"Andy changed their display name and profile picture"`);
         });
+
+        it("should handle rejected invites", () => {
+            expect(
+                textForEvent(
+                    new MatrixEvent({
+                        type: "m.room.member",
+                        sender: "@a:foo",
+                        content: {
+                            membership: KnownMembership.Leave,
+                        },
+                        unsigned: {
+                            prev_content: {
+                                membership: KnownMembership.Invite,
+                            },
+                        },
+                        state_key: "@a:foo",
+                    }),
+                    mockClient,
+                ),
+            ).toMatchInlineSnapshot(`"Member rejected the invitation"`);
+        });
+
+        it("should handle rejected invites with a reason", () => {
+            expect(
+                textForEvent(
+                    new MatrixEvent({
+                        type: "m.room.member",
+                        sender: "@a:foo",
+                        content: {
+                            membership: KnownMembership.Leave,
+                            reason: "I don't want to be in this room.",
+                        },
+                        unsigned: {
+                            prev_content: {
+                                membership: KnownMembership.Invite,
+                            },
+                        },
+                        state_key: "@a:foo",
+                    }),
+                    mockClient,
+                ),
+            ).toMatchInlineSnapshot(`"Member rejected the invitation: I don't want to be in this room."`);
+        });
     });
 
     describe("textForJoinRulesEvent()", () => {