Hide TextRange. It has no public usage. (#20893)

* Hide TextRange. It has no public usage.

* Update api diff

api/Avalonia.Headless.XUnit.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>

api/Avalonia.Headless.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>

api/Avalonia.LinuxFramebuffer.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>

api/Avalonia.Skia.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>

api/Avalonia.Win32.Interoperability.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>

api/Avalonia.nupkg.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/diagnostic-ids -->
 <Suppressions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Suppression>
@@ -163,6 +163,12 @@
     <Left>baseline/Avalonia/lib/net10.0/Avalonia.Base.dll</Left>
     <Right>current/Avalonia/lib/net10.0/Avalonia.Base.dll</Right>
   </Suppression>
+  <Suppression>
+    <DiagnosticId>CP0001</DiagnosticId>
+    <Target>T:Avalonia.Media.TextFormatting.TextRange</Target>
+    <Left>baseline/Avalonia/lib/net10.0/Avalonia.Base.dll</Left>
+    <Right>current/Avalonia/lib/net10.0/Avalonia.Base.dll</Right>
+  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:Avalonia.Platform.IGeometryContext2</Target>
@@ -631,6 +637,12 @@
     <Left>baseline/Avalonia/lib/net8.0/Avalonia.Base.dll</Left>
     <Right>current/Avalonia/lib/net8.0/Avalonia.Base.dll</Right>
   </Suppression>
+  <Suppression>
+    <DiagnosticId>CP0001</DiagnosticId>
+    <Target>T:Avalonia.Media.TextFormatting.TextRange</Target>
+    <Left>baseline/Avalonia/lib/net8.0/Avalonia.Base.dll</Left>
+    <Right>current/Avalonia/lib/net8.0/Avalonia.Base.dll</Right>
+  </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
     <Target>T:Avalonia.Platform.IGeometryContext2</Target>

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

@@ -132,5 +132,71 @@ namespace Avalonia.Media.TextFormatting
 
             return Math.Min(length, text.Length);
         }
+
+        /// <summary>
+        /// References a portion of a text buffer.
+        /// </summary>
+        private readonly record struct TextRange
+        {
+            public TextRange(int start, int length)
+            {
+                Start = start;
+                Length = length;
+            }
+
+            /// <summary>
+            /// Gets the start.
+            /// </summary>
+            /// <value>
+            /// The start.
+            /// </value>
+            public int Start { get; }
+
+            /// <summary>
+            /// Gets the length.
+            /// </summary>
+            /// <value>
+            /// The length.
+            /// </value>
+            public int Length { get; }
+
+            /// <summary>
+            /// Gets the end.
+            /// </summary>
+            /// <value>
+            /// The end.
+            /// </value>
+            public int End => Start + Length - 1;
+
+            /// <summary>
+            /// Returns a specified number of contiguous elements from the start of the slice.
+            /// </summary>
+            /// <param name="length">The number of elements to return.</param>
+            /// <returns>A <see cref="TextRange"/> that contains the specified number of elements from the start of this slice.</returns>
+            public TextRange Take(int length)
+            {
+                if (length > Length)
+                {
+                    throw new ArgumentOutOfRangeException(nameof(length));
+                }
+
+                return new TextRange(Start, length);
+            }
+
+            /// <summary>
+            /// Bypasses a specified number of elements in the slice and then returns the remaining elements.
+            /// </summary>
+            /// <param name="length">The number of elements to skip before returning the remaining elements.</param>
+            /// <returns>A <see cref="TextRange"/> that contains the elements that occur after the specified index in this slice.</returns>
+            public TextRange Skip(int length)
+            {
+                if (length > Length)
+                {
+                    throw new ArgumentOutOfRangeException(nameof(length));
+                }
+
+                return new TextRange(Start + length, Length - length);
+            }
+        }
     }
 }

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

@@ -1,70 +0,0 @@
-using System;
-
-namespace Avalonia.Media.TextFormatting
-{
-    /// <summary>
-    /// References a portion of a text buffer.
-    /// </summary>
-    public readonly record struct TextRange
-    {
-        public TextRange(int start, int length)
-        {
-            Start = start;
-            Length = length;
-        }
-
-        /// <summary>
-        /// Gets the start.
-        /// </summary>
-        /// <value>
-        /// The start.
-        /// </value>
-        public int Start { get; }
-
-        /// <summary>
-        /// Gets the length.
-        /// </summary>
-        /// <value>
-        /// The length.
-        /// </value>
-        public int Length { get; }
-
-        /// <summary>
-        /// Gets the end.
-        /// </summary>
-        /// <value>
-        /// The end.
-        /// </value>
-        public int End => Start + Length - 1;
-
-        /// <summary>
-        /// Returns a specified number of contiguous elements from the start of the slice.
-        /// </summary>
-        /// <param name="length">The number of elements to return.</param>
-        /// <returns>A <see cref="TextRange"/> that contains the specified number of elements from the start of this slice.</returns>
-        public TextRange Take(int length)
-        {
-            if (length > Length)
-            {
-                throw new ArgumentOutOfRangeException(nameof(length));
-            }
-
-            return new TextRange(Start, length);
-        }
-
-        /// <summary>
-        /// Bypasses a specified number of elements in the slice and then returns the remaining elements.
-        /// </summary>
-        /// <param name="length">The number of elements to skip before returning the remaining elements.</param>
-        /// <returns>A <see cref="TextRange"/> that contains the elements that occur after the specified index in this slice.</returns>
-        public TextRange Skip(int length)
-        {
-            if (length > Length)
-            {
-                throw new ArgumentOutOfRangeException(nameof(length));
-            }
-
-            return new TextRange(Start + length, Length - length);
-        }
-    }
-}

tests/Avalonia.Skia.UnitTests/Media/TextFormatting/MultiBufferTextSource.cs

@@ -1,4 +1,5 @@
-using Avalonia.Media.TextFormatting;
+using System;
+using Avalonia.Media.TextFormatting;
 
 namespace Avalonia.Skia.UnitTests.Media.TextFormatting
 {
@@ -14,8 +15,6 @@ namespace Avalonia.Skia.UnitTests.Media.TextFormatting
             _runTexts = new[] { "A123456789", "B123456789", "C123456789", "D123456789", "E123456789" };
         }
 
-        public static TextRange TextRange => new TextRange(0, 50);
-
         public TextRun? GetTextRun(int textSourceIndex)
         {
             if (textSourceIndex >= 50)