Add new EnumValueEqualsConverter

src/Avalonia.Controls/Converters/EnumValueEqualsConverter.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace Avalonia.Controls.Converters
+{
+    /// <summary>
+    /// Converter that checks if an enum value is equal to the given parameter enum value.
+    /// </summary>
+    public class EnumValueEqualsConverter : IValueConverter
+    {
+        /// <inheritdoc/>
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            // Note: Unlike string comparisons, null/empty is not supported
+            // Both 'value' and 'parameter' must exist and if both are missing they are not considered equal
+            if (value != null &&
+                parameter != null)
+            {
+                Type type = value.GetType();
+
+                if (type.IsEnum)
+                {
+                    var valueStr = value?.ToString();
+                    var paramStr = parameter?.ToString();
+
+                    if (string.Equals(valueStr, paramStr, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return true;
+                    }
+                }
+
+                /*
+                // TODO: When .net Standard 2.0 is no longer supported the code can be changed to below
+                // This is a little more type safe
+                if (type.IsEnum &&
+                    Enum.TryParse(type, value?.ToString(), true, out object? valueEnum) &&
+                    Enum.TryParse(type, parameter?.ToString(), true, out object? paramEnum))
+                {
+                    return valueEnum == paramEnum;
+                }
+                */
+            }
+
+            return false;
+        }
+
+        /// <inheritdoc/>
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}

src/Avalonia.Controls/Converters/MarginMultiplierConverter.cs

@@ -35,7 +35,6 @@ namespace Avalonia.Controls.Converters
                     Bottom ? Indent * thicknessDepth.Bottom : 0);
             }
             return new Thickness(0);
-            
         }
 
         public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)