[FileProvider] Adopt XAMCORE_4_0 changes in .NET. (#14012)

src/fileprovider.cs

@@ -19,7 +19,7 @@ using UniformTypeIdentifiers;
 using NativeHandle = System.IntPtr;
 #endif
 
-#if IOS && !XAMCORE_4_0 && !__MACCATALYST__
+#if IOS && !NET && !__MACCATALYST__
 using FileProvider;
 
 // This is the original (iOS 8) location of `NSFileProviderExtension`
@@ -262,7 +262,7 @@ namespace FileProvider {
 		ExcludingFromSync = 1 << 7,
 		AddingSubItems = Writing,
 		ContentEnumerating = Reading,
-#if !XAMCORE_4_0
+#if !NET
 		[Obsolete ("This enum value is not constant across OS and versions.")]
 	#if MONOMAC
 		All = Reading | Writing | Reparenting | Renaming | Trashing | Deleting | Evicting,
@@ -492,7 +492,7 @@ namespace FileProvider {
 		[Export ("favoriteRank", ArgumentSemantic.Copy)]
 		NSNumber GetFavoriteRank ();
 
-#if XAMCORE_4_0 // Not available in mac
+#if NET // Not available in mac
 		[NoMac]
 #elif MONOMAC
 		[Obsolete ("'IsTrashed' is not available in macOS and will be removed in the future.")]

tests/xtro-sharpie/api-annotations-dotnet/macOS-FileProvider.ignore

@@ -1,9 +1,5 @@
 ## the only member is not available on the macOS
 !missing-protocol! NSFileProviderItemDecorating not bound
 
-## This member is not available on mac
-## https://developer.apple.com/documentation/fileprovider/nsfileprovideritem/2879552-trashed?language=objc
-!extra-protocol-member! unexpected selector NSFileProviderItem::isTrashed found
-
 ## when deprecated (xcode12 beta 3) this member was marked as not available on macOS (but it was before)
 !extra-protocol-member! unexpected selector NSFileProviderItem::typeIdentifier found