Use antialiasing filter when rendering UI icons and actors.

OpenRA.Mods.Common/Widgets/ProductionPaletteWidget.cs

@@ -453,6 +453,7 @@ namespace OpenRA.Mods.Common.Widgets
 			var pios = currentQueue.Actor.Owner.PlayerActor.TraitsImplementing<IProductionIconOverlay>();
 
 			// Icons
+			Game.Renderer.EnableAntialiasingFilter();
 			foreach (var icon in icons.Values)
 			{
 				WidgetUtils.DrawSHPCentered(icon.Sprite, icon.Pos + iconOffset, icon.Palette);
@@ -477,6 +478,8 @@ namespace OpenRA.Mods.Common.Widgets
 					WidgetUtils.DrawSHPCentered(cantBuild.Image, icon.Pos + iconOffset, icon.IconDarkenPalette);
 			}
 
+			Game.Renderer.DisableAntialiasingFilter();
+
 			// Overlays
 			foreach (var icon in icons.Values)
 			{