Workaround clipboard copying bug

Fixes #273

panels/copyStringToClipboard.ts

@@ -4,6 +4,19 @@ export async function copyStringToClipboard(value: string) {
     try {
         await navigator.clipboard.writeText(value);
     } catch (e) {
-        KeeLog.error("Failed to write to clipboard");
+        try {
+            // Fallback to old textarea hack if required.
+            // See https://github.com/kee-org/browser-addon/issues/273
+            const copyFrom = document.createElement("textarea");
+            copyFrom.textContent = value;
+            const body = document.getElementsByTagName("body")[0];
+            body.appendChild(copyFrom);
+            copyFrom.select();
+            document.execCommand("copy");
+            body.removeChild(copyFrom);
+            KeeLog.info("Failed to write to clipboard using modern API so used the fallback hack");
+        } catch (e2) {
+            KeeLog.error("Failed to write to clipboard using modern API and fallback hack");
+        }
     }
 }

release-notes/update-notes.html

@@ -15,6 +15,10 @@ <h1 style="font-size: 42px; text-align: center;"><img src="/common/images/64.png
 <div id="mainContent">
     <div id="updateNotesContent">
 
+    <h2 style="margin-left:15px"><span data-i18n="version_upgrade_heading_changes"></span> 3.5.20</h2>
+
+    <p>Fixes a bug that caused copying existing and generated passwords to the clipboard to fail in some circumstances.</p>
+
     <h2 style="margin-left:15px"><span data-i18n="version_upgrade_heading_changes"></span> 3.5</h2>
 
     <p data-i18n="list_version_upgrade_3_5"></p>