Prevent history visible banner from displaying in threads. (#31535)

* fix: Prevent history visible banner from displaying in threads.

* tests: Verify banner is not visible in threads.

src/components/views/composer/HistoryVisibleBanner.tsx

@@ -11,7 +11,7 @@ import { type Room } from "matrix-js-sdk/src/matrix";
 
 import { HistoryVisibleBannerViewModel } from "../../../viewmodels/composer/HistoryVisibleBannerViewModel";
 
-export const HistoryVisibleBanner: React.FC<{ room: Room }> = ({ room }) => {
-    const vm = useCreateAutoDisposedViewModel(() => new HistoryVisibleBannerViewModel({ room }));
+export const HistoryVisibleBanner: React.FC<{ room: Room; threadId?: string | null }> = (props) => {
+    const vm = useCreateAutoDisposedViewModel(() => new HistoryVisibleBannerViewModel(props));
     return <HistoryVisibleBannerView vm={vm} />;
 };

src/components/views/rooms/MessageComposer.tsx

@@ -675,7 +675,7 @@ export class MessageComposer extends React.Component<IProps, IState> {
 
         return (
             <div className={classes} ref={this.ref} role="region" aria-label={_t("a11y|message_composer")}>
-                <HistoryVisibleBanner room={this.props.room} />
+                <HistoryVisibleBanner room={this.props.room} threadId={threadId} />
                 <div className="mx_MessageComposer_wrapper">
                     <UserIdentityWarning room={this.props.room} key={this.props.room.roomId} />
                     <ReplyPreview

src/viewmodels/composer/HistoryVisibleBannerViewModel.tsx

@@ -17,6 +17,7 @@ import { SettingLevel } from "../../settings/SettingLevel";
 
 interface Props {
     room: Room;
+    threadId?: string | null;
 }
 
 export class HistoryVisibleBannerViewModel
@@ -33,13 +34,17 @@ export class HistoryVisibleBannerViewModel
      */
     private readonly acknowledgedWatcher: string;
 
-    private static readonly computeSnapshot = (room: Room): HistoryVisibleBannerViewSnapshot => {
+    private static readonly computeSnapshot = (
+        room: Room,
+        threadId?: string | null,
+    ): HistoryVisibleBannerViewSnapshot => {
         const featureEnabled = SettingsStore.getValue("feature_share_history_on_invite");
         const acknowledged = SettingsStore.getValue("acknowledgedHistoryVisibility", room.roomId);
 
         return {
             visible:
                 featureEnabled &&
+                !threadId &&
                 room.hasEncryptionStateEvent() &&
                 room.getHistoryVisibility() !== HistoryVisibility.Joined &&
                 !acknowledged,
@@ -47,7 +52,7 @@ export class HistoryVisibleBannerViewModel
     };
 
     public constructor(props: Props) {
-        super(props, HistoryVisibleBannerViewModel.computeSnapshot(props.room));
+        super(props, HistoryVisibleBannerViewModel.computeSnapshot(props.room, props.threadId));
 
         this.disposables.trackListener(props.room, RoomStateEvent.Update, () => this.setSnapshot());
 
@@ -77,7 +82,7 @@ export class HistoryVisibleBannerViewModel
             );
         }
 
-        this.snapshot.set(HistoryVisibleBannerViewModel.computeSnapshot(this.props.room));
+        this.snapshot.set(HistoryVisibleBannerViewModel.computeSnapshot(this.props.room, this.props.threadId));
     }
 
     /**

test/unit-tests/components/viewmodels/composer/HistoryVisibleBannerViewModel-test.tsx

@@ -104,6 +104,29 @@ describe("HistoryVisibleBannerViewModel", () => {
         vm.dispose();
     });
 
+    it("should not show the banner in threads", () => {
+        upsertRoomStateEvents(room, [
+            mkEvent({
+                event: true,
+                type: "m.room.encryption",
+                user: "@user1:server",
+                content: {},
+            }),
+            mkEvent({
+                event: true,
+                type: "m.room.history_visibility",
+                user: "@user1:server",
+                content: {
+                    history_visibility: "shared",
+                },
+            }),
+        ]);
+
+        const vm = new HistoryVisibleBannerViewModel({ room, threadId: "some thread ID" });
+        expect(vm.getSnapshot().visible).toBe(false);
+        vm.dispose();
+    });
+
     it("should show the banner in encrypted rooms with non-joined history visibility", async () => {
         upsertRoomStateEvents(room, [
             mkEvent({