fix(copyText): in iframe for chrome<85

react/features/base/buttons/CopyButton.js

      *
      * @returns {void}
      */
-    function onClick() {
+    async function onClick() {
         setIsHovered(false);
-        if (copyText(textToCopy)) {
+
+        const isCopied = await copyText(textToCopy);
+
+        if (isCopied) {
             setIsClicked(true);
 
             setTimeout(() => {

react/features/base/premeeting/components/web/CopyMeetingUrl.js

 import { Icon, IconCopy, IconCheck } from '../../../icons';
 import { connect } from '../../../redux';
 import { copyText, getDecodedURI } from '../../../util';
-import logger from '../../logger';
 
 type Props = {
 
      *
      * @returns {void}
      */
-    _copyUrl() {
-        const success = copyText(this.props.url);
+    async _copyUrl() {
+        const success = await copyText(this.props.url);
 
         if (success) {
             this._showLinkCopied();
      * @private
      * @returns {void}
      */
-    _copyUrlAutomatically() {
-        navigator.clipboard.writeText(this.props.url)
-            .then(() => {
-                this._showLinkCopied();
-                window.setTimeout(this._hideLinkCopied, COPY_TIMEOUT);
-            })
-            .catch(e => {
-                logger.error(e);
-            });
+    async _copyUrlAutomatically() {
+        const isCopied = await copyText(this.props.url);
+
+        if (isCopied) {
+            this._showLinkCopied();
+            window.setTimeout(this._hideLinkCopied, COPY_TIMEOUT);
+        }
     }
 
     /**

react/features/base/util/helpers.js

  * Returns true if the action succeeds.
  *
  * @param {string} textToCopy - Text to be copied.
- * @returns {boolean}
+ * @returns {Promise<boolean>}
  */
 export async function copyText(textToCopy: string) {
-    let result;
-
     try {
-        result = await navigator.clipboard.writeText(textToCopy);
-    } catch (err) {
-        result = false;
-    }
+        await navigator.clipboard.writeText(textToCopy);
+
+        return true;
+    } catch (clipboardAPIError) { // The Clipboard API is not supported.
+        let fakeTextArea = document.createElement('textarea');
+
+        // $FlowFixMe
+        fakeTextArea = document.body.appendChild(fakeTextArea);
+        fakeTextArea.value = textToCopy;
+        fakeTextArea.focus();
+        fakeTextArea.select();
+
+        let result;
 
-    return result;
+        try {
+            result = document.execCommand('copy');
+        } catch (error) {
+            result = false;
+        }
+
+        // $FlowFixMe
+        document.body.removeChild(fakeTextArea);
+
+
+        return result;
+    }
 }
 
 /**

react/features/invite/components/add-people-dialog/web/LiveStreamSection.js

      *
      * @returns {void}
      */
-    function onClick() {
+    async function onClick() {
         setIsHovered(false);
-        if (copyText(liveStreamViewURL)) {
+
+        const isCopied = copyText(liveStreamViewURL);
+
+        if (isCopied) {
             setIsClicked(true);
 
             setTimeout(() => {