Fixed the generation of copy ctors when mutiple inheritance is involved.

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

src/Generator/AST/Utils.cs

@@ -49,6 +49,8 @@ namespace CppSharp.AST
                 while (baseClass != null && baseClass.HasBaseClass)
                 {
                     baseClass = baseClass.BaseClass;
+                    if (!baseClass.IsInterface)
+                    {
                         var copyConstructor = baseClass.Methods.FirstOrDefault(m => m.IsCopyConstructor);
                         if (copyConstructor == null
                             || copyConstructor.Access == AccessSpecifier.Private
@@ -56,6 +58,7 @@ namespace CppSharp.AST
                             return true;   
                     }
                 }
+            }
 
             return false;
         }

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -156,4 +156,19 @@ public class CSharpTempTests : GeneratorTestFixture
     {
         Assert.AreEqual(TestFlag.Flag2, new ComplexType().ReturnsQFlags);
     }
+
+    [Test]
+    public void TestCopyCtor()
+    {
+        Qux q1 = new Qux();
+        for (int i = 0; i < q1.Array.Length; i++)
+        {
+            q1.Array[i] = i;
+        }
+        Qux q2 = new Qux(q1);
+        for (int i = 0; i < q2.Array.Length; i++)
+        {
+            Assert.AreEqual(q1.Array[i], q2.Array[i]);
+        }
+    }
 }