[mdoc] No longer documenting explicitly implemented private interface members.

https://bugzilla.xamarin.com/show_bug.cgi?id=18411

If a class explicitly implements an internal interface, those members will no
longer be documented, nor will the interface show up in the class' signature.
This allows for a library to hide internal implementation details that an end
user would not be able to take advantage of (ie. can't cast to internal
interface to call methods).

Includes test (check-monodocer-internal-interface)  added to makefile.

1 files changed, 17 insertions, 0 deletions

diff --git a/mdoc/Test/DocTest-InternalInterface.cs b/mdoc/Test/DocTest-InternalInterface.cs
new file mode 100644
index 00000000..5d65c34c
--- /dev/null
+++ b/mdoc/Test/DocTest-InternalInterface.cs
@@ -0,0 +1,17 @@
+namespace MyNamespace {
+	internal interface MyInternalInterface {
+		bool Foo {get;set;}
+		string FooSet {set;}
+		void FooMeth ();
+		void BarMeth ();
+	}
+
+	public class MyClass : MyInternalInterface {
+		public string Bar {get;set;}
+		public void BarMeth () {} // part of the interface, but publicly implemented
+
+		string MyInternalInterface.FooSet {set {}}
+		bool MyInternalInterface.Foo {get;set;}
+		void MyInternalInterface.FooMeth () {}
+	}
+}