Add NearlyEquals for Size.

src/Avalonia.Visuals/Size.cs

@@ -189,7 +189,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Returns a boolean indicating whether the size is equal to the other given size.
+        /// Returns a boolean indicating whether the size is equal to the other given size (bitwise).
         /// </summary>
         /// <param name="other">The other size to test equality against.</param>
         /// <returns>True if this size is equal to other; False otherwise.</returns>
@@ -201,6 +201,16 @@ namespace Avalonia
             // ReSharper enable CompareOfFloatsByEqualityOperator
         }
 
+        /// <summary>
+        /// Returns a boolean indicating whether the size is equal to the other given size (numerically).
+        /// </summary>
+        /// <param name="other">The other size to test equality against.</param>
+        /// <returns>True if this size is equal to other; False otherwise.</returns>
+        public bool NearlyEquals(Size other)
+        {
+            return MathUtilities.AreClose(_width, other._width) && MathUtilities.AreClose(_height, other._height);
+        }
+
         /// <summary>
         /// Checks for equality between a size and an object.
         /// </summary>