Merge pull request #12638 from MrJul/fix/inline-breaking-change

Revert Inline breaking change

src/Avalonia.Controls/Documents/Inline.cs

@@ -10,10 +10,11 @@ namespace Avalonia.Controls.Documents
     /// </summary>
     public abstract class Inline : TextElement
     {
+        // TODO12: change the field type to an AttachedProperty for consistency (breaking change)
         /// <summary>
         /// AvaloniaProperty for <see cref="TextDecorations" /> property.
         /// </summary>
-        public static readonly AttachedProperty<TextDecorationCollection?> TextDecorationsProperty =
+        public static readonly StyledProperty<TextDecorationCollection?> TextDecorationsProperty =
             AvaloniaProperty.RegisterAttached<Inline, Inline, TextDecorationCollection?>(
                 nameof(TextDecorations),
                 inherits: true);