#TTP 335685 - EDITOR: Level Browser: Allowed to click "move selected actor to level" on an actor that is already in the selected level
#branch UE4
#proj Editor.WorldBrowser
#proj Editor.Levels
#change Added a new method IsValidMoveActorsToLevel to both FLevelCollectionModel and FLevelCollectionViewModel, this is used to enable the Move Actor to level command for both cases. It scans the selected actors and checks their levels against the selected levels. If any actor is contained within any of the selected levels it disables the control. It also disables the control should there be no actors selected. If both of these cases pass it simply checks if the level is editable.
#reviewedby Chris.Wood
[CL 2113869 by Barnabas McManners in Main branch]