From 057a8f6f1b29325e382a51344db5e610ff5f0a7e Mon Sep 17 00:00:00 2001
From: Pete Blois <blois@google.com>
Date: Mon, 9 Nov 2020 11:00:44 -0800
Subject: [PATCH] Incorporate shadowRoot in focus calculation.

This adds a call to getRootNode to get either the Document or the
ShadowRoot to use when calculating whether the textarea has focus.

getRootNode is guarded for older browser compatibility (IE).
---
 src/browser/services/CoreBrowserService.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/browser/services/CoreBrowserService.ts b/src/browser/services/CoreBrowserService.ts
index 985253d9..4eabc895 100644
--- a/src/browser/services/CoreBrowserService.ts
+++ b/src/browser/services/CoreBrowserService.ts
@@ -14,6 +14,7 @@ export class CoreBrowserService implements ICoreBrowserService {
   }
 
   public get isFocused(): boolean {
-    return document.activeElement === this._textarea && document.hasFocus();
+    const docOrShadowRoot = this._textarea.getRootNode ? this._textarea.getRootNode() as Document | ShadowRoot : document;
+    return docOrShadowRoot.activeElement === this._textarea && document.hasFocus();
   }
 }