Generated valid code when C++ changes method access when overriding.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2223,14 +2223,9 @@ namespace CppSharp.Generators.CSharp
 
         private static AccessSpecifier GetValidMethodAccess(Method method)
         {
-            switch (method.Access)
-            {
-                case AccessSpecifier.Public:
-                    return AccessSpecifier.Public;
-                default:
-                    return method.IsOverride ?
-                        ((Class) method.Namespace).GetRootBaseMethod(method).Access : method.Access;
-            }
+            return method.IsOverride
+                ? ((Class) method.Namespace).GetRootBaseMethod(method).Access
+                : method.Access;
         }
 
         private static AccessSpecifier GetValidPropertyAccess(Property property)

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -210,7 +210,8 @@ public class CSharpTempTests : GeneratorTestFixture
     [Test]
     public void TestPrivateOverride()
     {
-        new HasPrivateOverride().PrivateOverride();
+        using (var hasOverridesWithChangedAccess = new HasOverridesWithChangedAccess())
+            hasOverridesWithChangedAccess.PrivateOverride();
     }
 
     [Test]

tests/CSharpTemp/CSharpTemp.cpp

@@ -469,15 +469,27 @@ int MethodsWithDefaultValues::getA()
     return m_foo.A;
 }
 
-void HasPrivateOverrideBase::privateOverride(int i)
+HasOverridesWithChangedAccessBase::HasOverridesWithChangedAccessBase()
 {
 }
 
-HasPrivateOverride::HasPrivateOverride()
+void HasOverridesWithChangedAccessBase::privateOverride(int i)
 {
 }
 
-void HasPrivateOverride::privateOverride(int i)
+void HasOverridesWithChangedAccessBase::publicOverride()
+{
+}
+
+HasOverridesWithChangedAccess::HasOverridesWithChangedAccess()
+{
+}
+
+void HasOverridesWithChangedAccess::privateOverride(int i)
+{
+}
+
+void HasOverridesWithChangedAccess::publicOverride()
 {
 }
 

tests/CSharpTemp/CSharpTemp.h

@@ -363,16 +363,20 @@ private:
     Foo m_foo;
 };
 
-class DLL_API HasPrivateOverrideBase
+class DLL_API HasOverridesWithChangedAccessBase
 {
 public:
+    HasOverridesWithChangedAccessBase();
     virtual void privateOverride(int i = 5);
+protected:
+    virtual void publicOverride();
 };
 
-class DLL_API HasPrivateOverride : public HasPrivateOverrideBase
+class DLL_API HasOverridesWithChangedAccess : public HasOverridesWithChangedAccessBase
 {
 public:
-    HasPrivateOverride();
+    HasOverridesWithChangedAccess();
+    void publicOverride();
 private:
     virtual void privateOverride(int i);
 };