Fix default values for touchbar APIs in NSTextViewDelegate. (#3843) (#4071)

src/appkit.cs

@@ -19023,20 +19023,20 @@ namespace AppKit {
 		NSUndoManager GetUndoManager (NSTextView view);
 
 		[Mac (10,12,2)]
-		[Export ("textView:shouldUpdateTouchBarItemIdentifiers:"), DelegateName ("NSTextViewUpdateTouchBarItemIdentifiers"), DefaultValue (null)]
+		[Export ("textView:shouldUpdateTouchBarItemIdentifiers:"), DelegateName ("NSTextViewUpdateTouchBarItemIdentifiers"), NoDefaultValue]
 		string[] ShouldUpdateTouchBarItemIdentifiers (NSTextView textView, string[] identifiers);
 
 		[Mac (10,12,2)]
-		[Export ("textView:candidatesForSelectedRange:"), DelegateName ("NSTextViewGetCandidates"), DefaultValue (null)]
+		[Export ("textView:candidatesForSelectedRange:"), DelegateName ("NSTextViewGetCandidates"), NoDefaultValue]
 		[return: NullAllowed]
 		NSObject[] GetCandidates (NSTextView textView, NSRange selectedRange);
 
 		[Mac (10,12,2)]
-		[Export ("textView:candidates:forSelectedRange:"), DelegateName ("NSTextViewTextCheckingResults"), DefaultValue (null)]
+		[Export ("textView:candidates:forSelectedRange:"), DelegateName ("NSTextViewTextCheckingResults"), NoDefaultValue]
 		NSTextCheckingResult[] GetTextCheckingCandidates (NSTextView textView, NSTextCheckingResult[] candidates, NSRange selectedRange);
 
 		[Mac (10,12,2)]
-		[Export ("textView:shouldSelectCandidateAtIndex:"), DelegateName ("NSTextViewSelectCandidate"), DefaultValue (false)]
+		[Export ("textView:shouldSelectCandidateAtIndex:"), DelegateName ("NSTextViewSelectCandidate"), NoDefaultValue]
 		bool ShouldSelectCandidates (NSTextView textView, nuint index);
 
 	}