#ttp 334592 - When an asset is deleted from the content browser, it should be removed from the 'recently placed' list as well to avoid confusion
#branch UE4
#proj Editor.PlacementMode
#add Added FPlacementMode::OnAssetRemoved, which forces a refresh of the recently placed list. Added a call to this method in the OnAssetRemoved event in AssetRegistryModule.
#add In SPlacementModeTools::RefreshRecentlyPlaced, the list of asset paths is iterated, and those which yield a valid FAssetData object are added to the widget container. In the case of a just deleted widget, the UObject is only marked as pending delete (it has had its RF_Standalone flag cleared), and a GC sweep cannot yet have happened, so it's necessary to explicitly check for this flag set when iterating.
[CL 2073929 by Richard TalbotWatkin in Main branch]
- Modified FKismetEditorUtilities::CanCreateBlueprintFromClass() to return false if the input class is a BP skeleton class.
- Modified FKismetEditorUtilities::IsClassABlueprintSkeleton() to incorporate the alternative class flags check in case the SkeletonGeneratedClass has not yet been loaded during serialization.
- Replaced individual occurrences of the alternative class flags skeleton class check with FKismetEditorUtilities::IsClassABlueprintSkeleton() instead (for consistency and per discussion).
[CL 2063239 by Phillip Kavan in Main branch]
