Fix selected province fade flicker (#8700)

src/main/csharp/net/eagle0/clients/unity/eagle0/Assets/Eagle/Editor/EagleMapMaterialWiringTests.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Linq;
 using eagle;
 using NUnit.Framework;
@@ -50,6 +51,23 @@ namespace eagle0.Tests {
                     "ProvinceWeatherController should update the project weather map material.");
         }
 
+        [Test]
+        public void MapAnimationRunsAfterModelUpdates() {
+            Assert.Greater(
+                    ExecutionOrderFor(typeof(MapController)),
+                    ExecutionOrderFor(typeof(EagleGameController)),
+                    "MapController must animate province colors after EagleGameController can " +
+                            "replace the model and reset their base colors.");
+        }
+
+        private static int ExecutionOrderFor(Type componentType) {
+            var attribute =
+                    componentType.GetCustomAttributes(typeof(DefaultExecutionOrder), inherit: false)
+                            .Cast<DefaultExecutionOrder>()
+                            .SingleOrDefault();
+            return attribute?.order ?? 0;
+        }
+
         private static Material LoadMaterial(string path, string expectedShaderName) {
             var material = AssetDatabase.LoadAssetAtPath<Material>(path);
             Assert.NotNull(material, $"{path} must exist.");

src/main/csharp/net/eagle0/clients/unity/eagle0/Assets/Eagle/MapController.cs

@@ -10,6 +10,9 @@ using ProvinceId = System.Int32;
 using FactionId = System.Int32;
 
 namespace eagle {
+    // Model and highlight state are updated by other controllers in Update. Run afterward so an
+    // incoming model cannot overwrite the animated province colors before they are rendered.
+    [DefaultExecutionOrder(100)]
     public class MapController : MonoBehaviour {
         public EagleGameController eagleGameController;