fix(OpenUI5Support): fix error on Firefox#13794
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Jul 8, 2026
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fixes #13783
In Firefox, the exception target.closest is not a function occurs when a popup is open, the user shifts focus away from the window (e.g., to the address bar), and then refocuses the popup. Firefox first dispatches a focus event where the target is the Document instead of an element, and Document does not implement closest().