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frontend/test/common/util
Franck Nijhof 26bdff9a16 Fix clipboard fallback throwing when active element is in the light DOM (#52578)
When the async Clipboard API is unavailable or rejects, copyToClipboard
falls back to a hidden textarea and execCommand. It appended that textarea
to deepActiveElement()?.getRootNode(). When the deepest active element
lives in the light DOM, getRootNode() returns the Document node, and
appending an element to a Document throws HierarchyRequestError (only the
single documentElement is allowed), so the fallback copy silently failed.

Append to document.body when the resolved root is a Document. Shadow roots
and elements keep holding the textarea directly, preserving execCommand
behavior inside dialogs that trap focus.
2026-06-13 11:14:57 +02:00
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