Save using consistent newline and support parsing different newlines (#13569)

src/Umbraco.Infrastructure/PropertyEditors/MultipleTextStringPropertyEditor.cs

@@ -68,6 +68,9 @@ public class MultipleTextStringPropertyEditor : DataEditor
     /// </summary>
     internal class MultipleTextStringPropertyValueEditor : DataValueEditor
     {
+        private static readonly string NewLine = "\n";
+        private static readonly string[] NewLineDelimiters = { "\r\n", "\r", "\n" };
+
         private readonly ILocalizedTextService _localizedTextService;
 
         public MultipleTextStringPropertyValueEditor(
@@ -119,10 +122,10 @@ public class MultipleTextStringPropertyEditor : DataEditor
             // only allow the max if over 0
             if (max > 0)
             {
-                return string.Join(Environment.NewLine, array.Take(max));
+                return string.Join(NewLine, array.Take(max));
             }
 
-            return string.Join(Environment.NewLine, array);
+            return string.Join(NewLine, array);
         }
 
         /// <summary>
@@ -131,7 +134,6 @@ public class MultipleTextStringPropertyEditor : DataEditor
         ///     cannot have 2 way binding, so to get around that each item in the array needs to be an object with a string.
         /// </summary>
         /// <param name="property"></param>
-        /// <param name="dataTypeService"></param>
         /// <param name="culture"></param>
         /// <param name="segment"></param>
         /// <returns></returns>
@@ -141,8 +143,9 @@ public class MultipleTextStringPropertyEditor : DataEditor
         public override object ToEditor(IProperty property, string? culture = null, string? segment = null)
         {
             var val = property.GetValue(culture, segment);
-            return val?.ToString()?.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
-                .Select(x => JObject.FromObject(new { value = x })) ?? new JObject[] { };
+
+            return val?.ToString()?.Split(NewLineDelimiters, StringSplitOptions.None).Select(x => JObject.FromObject(new { value = x }))
+                ?? Array.Empty<JObject>();
         }
     }