[unity] Timeline count tooltip for animation list.

spine-unity/Assets/Spine/Editor/spine-unity/Editor/SkeletonDataAssetInspector.cs

@@ -451,7 +451,8 @@ namespace Spine.Unity.Editor {
 					}
 					//string frameCountString = (fps > 0) ? ("(" + (Mathf.RoundToInt(animation.Duration * fps)) + ")").PadLeft(12, ' ') : string.Empty;
 					//EditorGUILayout.LabelField(new GUIContent(animation.Name, Icons.animation), SpineInspectorUtility.TempContent(animation.Duration.ToString("f3") + "s" + frameCountString));
-					EditorGUILayout.LabelField(new GUIContent(animation.Name, Icons.animation), SpineInspectorUtility.TempContent(animation.Duration.ToString("f3") + "s"));
+					string durationString = animation.Duration.ToString("f3");
+					EditorGUILayout.LabelField(new GUIContent(animation.Name, Icons.animation), SpineInspectorUtility.TempContent(durationString + "s", tooltip: string.Format("{0} seconds\n{1} timelines", durationString, animation.Timelines.Count)));
 				}
 			}
 		}