Clipboard: fix copyText() in popup windows

Modern browsers offer a clipboard API on the 'navigator' object. The
writeText() method will throw an error if the window is not in focus.
It is therefore important to use the correct window object. Like the
document, the window has to be retrieved from the given 'parent' widget.

378306

eclipse-scout-core/src/util/clipboard.js

@@ -61,13 +61,14 @@ export function copyText(options) {
 export function _copyText(options) {
   // Modern clipboard API
   // https://developer.mozilla.org/en-US/docs/Web/API/Clipboard_API
-  if (navigator.clipboard) {
-    return navigator.clipboard.writeText(options.text);
+  let win = options?.parent?.window(true) || window;
+  if (win.navigator.clipboard) {
+    return win.navigator.clipboard.writeText(options.text);
   }
 
   // Fallback for browsers that don't support the modern clipboard API (IE, Safari, Chrome < 66, Firefox < 63)
   // Create invisible textarea field and use document command "copy" to copy the text to the clipboard
-  let doc = (options.parent && options.parent.rendered ? options.parent.document(true) : document);
+  let doc = options?.parent?.document(true) || document;
   let f = doc.createElement('textarea');
   f.style.position = 'fixed';
   f.style.opacity = '0.0';
@@ -126,8 +127,7 @@ export function _failedStatus(session) {
  * has been copied to the clipboard successfully. By passing a different status, the
  * message can be changed.
  *
- * @param parent
- *          Widget that wants show the notification. Mandatory. Required for NLS texts.
+ * @param parent Widget that wants to show the notification. Mandatory. Required for NLS texts.
  */
 export function showNotification(parent, status) {
   scout.assertParameter('parent', parent);