[Foundation] Move NSAttributedStringDocumentAttributes.Timeout to shared code.

src/Foundation/NSAttributedString.mac.cs

@@ -138,10 +138,6 @@ namespace Foundation
 	}
 
 	public partial class NSAttributedStringDocumentAttributes : DictionaryContainer {
-		public float? Timeout { 
-			get { return GetFloatValue (NSStringAttributeKey.NSTimeoutDocumentOption); }
-			set { SetNumberValue (NSStringAttributeKey.NSTimeoutDocumentOption, (float?)value); }
-		}
 	}
 }
 

src/Foundation/NSAttributedStringDocumentAttributes.cs

@@ -361,6 +361,23 @@ namespace Foundation {
 		}
 #endif // !__MACOS__
 
+#if __MACOS__
+#if NET
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("tvos")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[SupportedOSPlatform ("macos")]
+#endif // NET
+		public float? Timeout {
+			get {
+				return GetFloatValue (NSAttributedStringDocumentReadingOptionKey.NSTimeoutDocumentOption);
+			}
+			set {
+				SetNumberValue (NSAttributedStringDocumentReadingOptionKey.NSTimeoutDocumentOption, value);
+			}
+		}
+#endif // !__MACOS__
+
 #endif // !COREBUILD
 	}
 }

src/appkit.cs

@@ -15524,9 +15524,6 @@ namespace AppKit {
 		NSString TextEffect { get; }
 
 		// Internal
-		[Internal, Field ("NSTimeoutDocumentOption")]
-		NSString NSTimeoutDocumentOption { get; }
-
 		[Internal, Field ("NSFileTypeDocumentOption")]
 		NSString NSFileTypeDocumentOption { get; }
 

src/xkit.cs

@@ -4411,5 +4411,8 @@ namespace UIKit {
 		[Internal, Field ("NSTextSizeMultiplierDocumentOption")]
 		NSString NSTextSizeMultiplierDocumentOption { get; }
 
+		[NoiOS, NoTV, NoWatch, NoMacCatalyst]
+		[Internal, Field ("NSTimeoutDocumentOption")]
+		NSString NSTimeoutDocumentOption { get; }
 	}
 }