Resize moving army popup backing (#8408)

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

@@ -3,6 +3,7 @@ using System.Linq;
 using common;
 using Net.Eagle0.Eagle.Views;
 using UnityEngine;
+using UnityEngine.UI;
 using FactionId = System.Int32;
 using ProvinceId = System.Int32;
 
@@ -56,6 +57,7 @@ namespace eagle {
                     row.BattalionSize.gameObject.SetActive(false);
                 }
             }
+            ResizeMovingArmyPopup(movingArmy.UnitDetails.Count);
             movingArmyPopupPanel.SetActive(true);
         }
 
@@ -65,9 +67,27 @@ namespace eagle {
             row.SetSummaryText(MovingArmySummaryText(movingArmy));
             row.BattalionImage.gameObject.SetActive(false);
             row.BattalionSize.gameObject.SetActive(false);
+            ResizeMovingArmyPopup(1);
             movingArmyPopupPanel.SetActive(true);
         }
 
+        private void ResizeMovingArmyPopup(int rowCount) {
+            var rowHeight =
+                    movingArmyPopupTable.rowPrefab.GetComponent<LayoutElement>().preferredHeight;
+            var contentLayout =
+                    movingArmyPopupTable.contentViewTransform.GetComponent<LayoutGroup>();
+            var popupLayout = movingArmyPopupPanel.GetComponent<LayoutGroup>();
+
+            var contentHeight = rowCount * rowHeight + contentLayout.padding.vertical;
+            ((RectTransform)movingArmyPopupTable.contentViewTransform)
+                    .SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, contentHeight);
+
+            var popupHeight = contentHeight + popupLayout.padding.vertical;
+            movingArmyPopupPanel.GetComponent<RectTransform>().SetSizeWithCurrentAnchors(
+                    RectTransform.Axis.Vertical,
+                    popupHeight);
+        }
+
         private static string MovingArmySummaryText(IncomingArmyView movingArmy) {
             if (movingArmy.HeroCount == 0 && movingArmy.TroopCount == 0) {
                 var supplies = new List<string>();