Remove PPos overload of FindUnits.

OpenRA.Game/Widgets/WorldInteractionControllerWidget.cs

@@ -185,7 +185,7 @@ namespace OpenRA.Widgets
 		static readonly Actor[] NoActors = {};
 		IEnumerable<Actor> SelectActorsInBox(World world, PPos a, PPos b, Func<Actor, bool> cond)
 		{
-			return world.FindUnits(a, b)
+			return world.FindUnits(a.ToWPos(0), b.ToWPos(0))
 				.Where(x => x.HasTrait<Selectable>() && x.Trait<Selectable>().Info.Selectable && !world.FogObscures(x) && cond(x))
 				.GroupBy(x => x.GetSelectionPriority())
 				.OrderByDescending(g => g.Key)