Fix bidi mirror handling

src/Avalonia.Base/Media/TextFormatting/TextCharacters.cs

@@ -76,7 +76,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 if (script == Script.Common && previousTypeface is not null)
                 {
-                    if (TryGetShapeableLength(text, previousTypeface.Value, defaultTypeface, out var fallbackCount, out _))
+                    if (TryGetShapeableLength(text, previousTypeface.Value, null, out var fallbackCount, out _))
                     {
                         return new ShapeableTextCharacters(text.Take(fallbackCount),
                             defaultProperties.WithTypeface(previousTypeface.Value), biDiLevel);

src/Avalonia.Base/Media/TextFormatting/Unicode/BiDiData.cs

@@ -71,9 +71,6 @@ namespace Avalonia.Media.TextFormatting.Unicode
 
             // Resolve the BidiCharacterType, paired bracket type and paired
             // bracket values for all code points
-            HasBrackets = false;
-            HasEmbeddings = false;
-            HasIsolates = false;
 
             int i = Length;
              

src/Skia/Avalonia.Skia/TextShaperImpl.cs

@@ -27,7 +27,7 @@ namespace Avalonia.Skia
                 
                 buffer.GuessSegmentProperties();
 
-                buffer.Direction = Direction.LeftToRight; //Always shape LeftToRight
+                buffer.Direction = (bidiLevel & 1) == 0 ? Direction.LeftToRight : Direction.RightToLeft;
 
                 buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture);              
 
@@ -35,6 +35,11 @@ namespace Avalonia.Skia
 
                 font.Shape(buffer);
 
+                if(buffer.Direction == Direction.RightToLeft)
+                {
+                    buffer.Reverse();
+                }
+
                 font.GetScale(out var scaleX, out _);
 
                 var textScale = fontRenderingEmSize / scaleX;

src/Windows/Avalonia.Direct2D1/Media/TextShaperImpl.cs

@@ -27,7 +27,7 @@ namespace Avalonia.Direct2D1.Media
 
                 buffer.GuessSegmentProperties();
 
-                buffer.Direction = Direction.LeftToRight; //Always shape LeftToRight
+                buffer.Direction = (bidiLevel & 1) == 0 ? Direction.LeftToRight : Direction.RightToLeft;
 
                 buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture);
 
@@ -35,6 +35,11 @@ namespace Avalonia.Direct2D1.Media
 
                 font.Shape(buffer);
 
+                if(buffer.Direction == Direction.RightToLeft)
+                {
+                    buffer.Reverse();
+                }
+
                 font.GetScale(out var scaleX, out _);
 
                 var textScale = fontRenderingEmSize / scaleX;