[AppKit] Implement a few missing fields for NSToolbar. Fixes #12871. (#18946)

Fixes https://github.com/xamarin/xamarin-macios/issues/12871.

src/appkit.cs

@@ -20179,15 +20179,15 @@ namespace AppKit {
 		[Field ("NSToolbarSidebarTrackingSeparatorItemIdentifier")]
 		NSString NSToolbarSidebarTrackingSeparatorItemIdentifier { get; }
 
-		// https://github.com/xamarin/xamarin-macios/issues/12871
-		// [MacCatalyst (14,0)][NoMac]
-		// [Field ("NSToolbarPrimarySidebarTrackingSeparatorItemIdentifier")]
-		// NSString PrimarySidebarTrackingSeparatorItemIdentifier { get; }
+		[MacCatalyst (14, 0)]
+		[NoMac]
+		[Field ("NSToolbarPrimarySidebarTrackingSeparatorItemIdentifier", "UIKit")]
+		NSString PrimarySidebarTrackingSeparatorItemIdentifier { get; }
 
-		// https://github.com/xamarin/xamarin-macios/issues/12871
-		// [MacCatalyst (14,0)][NoMac]
-		// [Field ("NSToolbarSupplementarySidebarTrackingSeparatorItemIdentifier")]
-		// NSString SupplementarySidebarTrackingSeparatorItemIdentifier { get; }
+		[MacCatalyst (14, 0)]
+		[NoMac]
+		[Field ("NSToolbarSupplementarySidebarTrackingSeparatorItemIdentifier", "UIKit")]
+		NSString SupplementarySidebarTrackingSeparatorItemIdentifier { get; }
 
 		[Mac (13, 0), MacCatalyst (16, 0)]
 		[Export ("centeredItemIdentifiers", ArgumentSemantic.Copy)]

tests/xtro-sharpie/api-annotations-dotnet/MacCatalyst-UIKit.ignore

@@ -1,8 +1,3 @@
-# https://github.com/xamarin/xamarin-macios/issues/12871 
-# Catalyst field constants that are loaded from private UIKitCore are not being handled by Field attribute
-!missing-field! NSToolbarPrimarySidebarTrackingSeparatorItemIdentifier not bound
-!missing-field! NSToolbarSupplementarySidebarTrackingSeparatorItemIdentifier not bound
-
 # deprecated types, not working at runtime
 !missing-protocol! UISearchDisplayDelegate not bound