From adb8d104f2ebc29890b8c578e34a412e8c5c3fc2 Mon Sep 17 00:00:00 2001
From: austinw-fineart <40481873+austinw-fineart@users.noreply.github.com>
Date: Tue, 2 Sep 2025 17:40:25 +0800
Subject: [PATCH 1/2] fix(radio): move root assignment to mirror
 hostDisconnected

Fixes a regression caused by 688ab3c where calling hostConnected / hostDisconnected in rapid succession can cause root to become null.
---
 radio/internal/single-selection-controller.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/radio/internal/single-selection-controller.ts b/radio/internal/single-selection-controller.ts
index 052dc3057..4c006bc24 100644
--- a/radio/internal/single-selection-controller.ts
+++ b/radio/internal/single-selection-controller.ts
@@ -74,7 +74,6 @@ export class SingleSelectionController implements ReactiveController {
   constructor(private readonly host: SingleSelectionElement) {}
 
   hostConnected() {
-    this.root = this.host.getRootNode() as ParentNode;
     this.host.addEventListener('keydown', this.handleKeyDown);
     this.host.addEventListener('focusin', this.handleFocusIn);
     this.host.addEventListener('focusout', this.handleFocusOut);
@@ -90,6 +89,7 @@ export class SingleSelectionController implements ReactiveController {
     // connected at the same time.
     queueMicrotask(() => {
       // Update for the newly added host.
+      this.root = this.host.getRootNode() as ParentNode;
       this.updateTabIndices();
     });
   }

From 6010e52c8fcd53577a8cf2cee53095033f329d2a Mon Sep 17 00:00:00 2001
From: austinw-fineart <40481873+austinw-fineart@users.noreply.github.com>
Date: Wed, 3 Sep 2025 09:52:27 +0800
Subject: [PATCH 2/2] fix(radio): also move sibling uncheck logic after root
 assignment

---
 radio/internal/single-selection-controller.ts | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/radio/internal/single-selection-controller.ts b/radio/internal/single-selection-controller.ts
index 4c006bc24..e1bdc667d 100644
--- a/radio/internal/single-selection-controller.ts
+++ b/radio/internal/single-selection-controller.ts
@@ -77,11 +77,6 @@ export class SingleSelectionController implements ReactiveController {
     this.host.addEventListener('keydown', this.handleKeyDown);
     this.host.addEventListener('focusin', this.handleFocusIn);
     this.host.addEventListener('focusout', this.handleFocusOut);
-    if (this.host.checked) {
-      // Uncheck other siblings when attached if already checked. This mimics
-      // native <input type="radio"> behavior.
-      this.uncheckSiblings();
-    }
 
     // Update siblings after a microtask to allow other synchronous connected
     // callbacks to settle before triggering additional Lit updates. This avoids
@@ -90,6 +85,12 @@ export class SingleSelectionController implements ReactiveController {
     queueMicrotask(() => {
       // Update for the newly added host.
       this.root = this.host.getRootNode() as ParentNode;
+      if (this.host.checked) {
+        // Uncheck other siblings when attached if already checked. This mimics
+        // native <input type="radio"> behavior.
+        this.uncheckSiblings();
+      }
+
       this.updateTabIndices();
     });
   }