fix(web): multi-PR badges open the linked pull requests panel

apps/web/src/components/BranchToolbarBranchSelector.tsx

@@ -796,7 +796,7 @@ export function BranchToolbarBranchSelector({
           number={prNumber}
           url={prUrl}
           status={displayedPrStatus}
-          onOpenStack={() => useRightPanelStore.getState().open(threadRef, "pull-requests")}
+          onOpenList={() => useRightPanelStore.getState().open(threadRef, "pull-requests")}
           onOpenPullRequest={(event) => {
             if (prUrl) openPrLink(event, prUrl);
           }}

apps/web/src/components/Sidebar.tsx

@@ -1499,11 +1499,12 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: {
   );
 
   // Stacks show their layer count; multiple unrelated links show their total count.
-  // Plain clicks open T3; individual PR links also support opening the host in a new tab.
+  // Either opens the thread's pull requests tab; a single PR link opens that PR and still
+  // supports opening the host in a new tab.
   const prBadgeShape = supportsMultiplePullRequests
     ? resolveThreadPullRequestBadge(thread.pullRequests)
     : null;
-  const handlePrStackClick = useCallback(() => {
+  const handlePrListClick = useCallback(() => {
     useRightPanelStore.getState().open(threadRef, "pull-requests");
     if (!props.isActive) onThreadActivate(threadRef);
   }, [onThreadActivate, props.isActive, threadRef]);
@@ -1515,7 +1516,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: {
         number={pr?.number ?? currentLinkedPr?.number}
         url={pr?.url ?? currentLinkedPr?.url}
         status={prStatus}
-        onOpenStack={handlePrStackClick}
+        onOpenList={handlePrListClick}
         onOpenPullRequest={handlePrClick}
       />
     ) : null;

apps/web/src/components/ThreadStatusIndicators.tsx

@@ -195,23 +195,24 @@ export function resolveThreadPullRequestBadgePresentation({
  * The linked-PR badge shared by the sidebar and composer footer. The badge owns what it shows:
  * the state glyph and number at the meta size, in the state's color. The caller owns the control
  * it sits in through `render` (an inline link in a sidebar row, a toolbar control in the
- * composer), and the badge fills in the link or stack button behavior.
+ * composer), and the badge fills in the behavior: a single PR is a link to it, while a stack or
+ * several linked PRs is a button that opens the thread's pull requests tab.
  */
 export function ThreadPullRequestBadgeControl({
   render,
   badge,
   number,
   url,
   status,
-  onOpenStack,
+  onOpenList,
   onOpenPullRequest,
 }: {
   render: ReactElement<{ render?: useRender.RenderProp }>;
   badge: ThreadPullRequestBadge | null;
   number?: number | undefined;
   url?: string | undefined;
   status: PrStatusIndicator | null;
-  onOpenStack: () => void;
+  onOpenList: () => void;
   onOpenPullRequest: (event: MouseEvent<HTMLElement>) => void;
 }) {
   const presentation = resolveThreadPullRequestBadgePresentation({ badge, number, url, status });
@@ -220,9 +221,9 @@ export function ThreadPullRequestBadgeControl({
     <PullRequestBadge
       render={render}
       presentation={presentation}
-      isStack={badge?.kind === "stack"}
+      opensList={badge !== null && (badge.kind === "stack" || badge.others > 0)}
       url={url}
-      onOpenStack={onOpenStack}
+      onOpenList={onOpenList}
       onOpenPullRequest={onOpenPullRequest}
     />
   );
@@ -231,26 +232,26 @@ export function ThreadPullRequestBadgeControl({
 function PullRequestBadge({
   render,
   presentation,
-  isStack,
+  opensList,
   url,
-  onOpenStack,
+  onOpenList,
   onOpenPullRequest,
 }: {
   render: ReactElement<{ render?: useRender.RenderProp }>;
   presentation: NonNullable<ReturnType<typeof resolveThreadPullRequestBadgePresentation>>;
-  isStack: boolean;
+  opensList: boolean;
   url: string | undefined;
-  onOpenStack: () => void;
+  onOpenList: () => void;
   onOpenPullRequest: (event: MouseEvent<HTMLElement>) => void;
 }) {
-  const onClick = isStack
+  const onClick = opensList
     ? (event: MouseEvent<HTMLElement>) => {
         event.preventDefault();
         event.stopPropagation();
-        onOpenStack();
+        onOpenList();
       }
     : onOpenPullRequest;
-  const element = isStack ? (
+  const element = opensList ? (
     <button type="button" />
   ) : (
     <a href={url} target="_blank" rel="noopener noreferrer" />

docs/user/source-control.md

@@ -157,7 +157,7 @@ on the Pull Requests page, **Link to thread** lets you search for an active thre
 also lists the threads that link to it, including archived threads, so you can return to their context.
 
 Thread badges show a stack's layer count or the current review number with a count of additional
-links. On mobile, the Git overview lists linked reviews and their stacks; tap a review to open it.
+links. Clicking a badge with more than one review opens the **Linked pull requests** panel. On mobile, the Git overview lists linked reviews and their stacks; tap a review to open it.
 Linking and unlinking are available in the web and desktop clients.
 
 The **Linked pull requests** panel lists every review and groups stacks. Unlink a review from its