#branch UE4
#proj Editor.UnrealEd
#summary Invalidate all level viewport hit proxies when opening a new level, so that click events cannot access old data on the first tick in a new world.
#add Added UEditorEngine::InvalidateAllViewportClientHitProxies() to iterate through all active level viewport clients and invalidate their hit proxies.
#add Added call to InvalidateAllViewportClientHitProxies() in UEditorEngine::NewMap() and UEditorEngine::Map_Load().
#reviewedby Chris.Wood, Max.Preussner
[CL 2050214 by Richard TalbotWatkin in Main branch]
97dd74bb8e