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SActorDetails now operates on a given UTypedElementSelectionSet (removing its dependence on the global selection), and also operates based on the list of selected top-level elements rather than the selected actors. UTypedElementDetailsInterface provides the interface needed for an element to be used with the details panel, with ITypedElementDetailsObject being the underlying glue object. The ITypedElementDetailsObject instance will exist as long as the details panel is using it, so gives a lifetime to potentially synthesized UObject instances that are created purely for editing (eg, on instances). This change removes almost all direct use of UpdateFloatingPropertyWindowsFromActorList, with only a single use-case in the reference viewer remaining. Most code was already using UpdateFloatingPropertyWindows anyway, which now emits an extra OnElementSelectionChanged event in addition to its previous OnActorSelectionChanged event. UpdateFloatingPropertyWindowsFromActorList now only emits an OnOverridePropertyEditorSelection event and no longer emits an OnActorSelectionChanged event. SActorDetails is updated from both OnElementSelectionChanged and OnOverridePropertyEditorSelection, with the OnActorSelectionChanged event remaining for backwards compatability with existing code. #jira #rb Chris.Gagnon, Brooke.Hubert [CL 15037524 by Jamie Dale in ue5-main branch]