From e313c1ab7e4494a0cda274f9302c1f578ca91bc9 Mon Sep 17 00:00:00 2001
From: Artur Signell <artur@vaadin.com>
Date: Mon, 5 Jun 2023 08:48:29 +0300
Subject: [PATCH] fix: Theme injection in Safari with polyfill

The polyfill does not support push or splice, see https://github.com/calebdwilliams/construct-style-sheets/issues/124
---
 .../resources/META-INF/frontend/theme-util.js     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/flow-server/src/main/resources/META-INF/frontend/theme-util.js b/flow-server/src/main/resources/META-INF/frontend/theme-util.js
index 75a9a6e9a69..ac7b8da4178 100644
--- a/flow-server/src/main/resources/META-INF/frontend/theme-util.js
+++ b/flow-server/src/main/resources/META-INF/frontend/theme-util.js
@@ -42,9 +42,24 @@ const createLinkReferences = (css, target) => {
   return styleCss;
 };
 
+const addAdoptedStyleSafariPolyfill = (sheet, target, first) => {
+  if (first) {
+    target.adoptedStyleSheets = [sheet, ...target.adoptedStyleSheets];
+  } else {
+    target.adoptedStyleSheets = [...target.adoptedStyleSheets, sheet];
+  }
+  return () => {
+    target.adoptedStyleSheets = target.adoptedStyleSheets.filter((ss) => ss !== sheet);
+  };
+};
+
 const addAdoptedStyle = (cssText, target, first) => {
   const sheet = new CSSStyleSheet();
   sheet.replaceSync(cssText);
+  if (!target.adoptedStyleSheets.splice) {
+    // Safari 15 - 16.3, polyfilled
+    return addAdoptedStyleSafariPolyfill(sheet, target, first);
+  }
   if (first) {
     target.adoptedStyleSheets.splice(0, 0, sheet);
   } else {