From bf61fc34b74baf2fb7884fae344a31f0f9fc708d Mon Sep 17 00:00:00 2001
From: Marijn Haverbeke <marijn@haverbeke.nl>
Date: Mon, 2 Dec 2019 09:59:00 +0100
Subject: [PATCH] Polyfill ShadowRoot.getSelection when not available

FIX: The `root` accessor on views now makes sure that, when it returns a
shadow root, that object has a `getSelection` method.

See https://discuss.prosemirror.net/t/prosemirror-inside-a-shadowroot/2387
---
 src/index.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 47858fc6..0757f8d0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -247,8 +247,10 @@ export class EditorView {
   get root() {
     let cached = this._root
     if (cached == null) for (let search = this.dom.parentNode; search; search = search.parentNode) {
-      if (search.nodeType == 9 || (search.nodeType == 11 && search.host))
+      if (search.nodeType == 9 || (search.nodeType == 11 && search.host)) {
+        if (!search.getSelection) Object.getPrototypeOf(search).getSelection = () => document.getSelection()
         return this._root = search
+      }
     }
     return cached || document
   }