Problem binding EventArgs with different parameters

[jpobst]

The following unit test creates a Listener that has the same event with different parameters.

[Test]
public void WriteInterfaceEventArgs2 ()
{
	var iface = SupportTypeBuilder.CreateEmptyInterface ("java.code.AnimatorListener");

	var method1 = SupportTypeBuilder.CreateMethod (iface, "onAnimationEnd", options, "void", false, true, new Parameter ("param1", "int", "int", false));
	var method2 = SupportTypeBuilder.CreateMethod (iface, "onAnimationEnd", options, "void", false, true, new Parameter ("param1", "int", "int", false), new Parameter ("param2", "int", "int", false));

	iface.Methods.Add (method1);
	iface.Methods.Add (method2);

	generator.Context.ContextTypes.Push (iface);
	generator.WriteInterfaceEventHandler (iface, string.Empty);
	generator.Context.ContextTypes.Pop ();

	Assert.AreEqual (GetExpected (nameof (WriteInterfaceEventArgs2)), writer.ToString ().NormalizeLineEndings ());
}

We magically convert these parameters into EventArgs, but we duplicate them as partial classes which doesn't compile:

// event args for java.code.AnimatorListener.onAnimationEnd
public partial class onAnimationEndEventArgs : global::System.EventArgs {

	public onAnimationEndEventArgs (int param1)
	{
		this.param1 = param1;
	}

	int param1;
	public int Param1 {
		get { return param1; }
	}
}

// event args for java.code.AnimatorListener.onAnimationEnd
public partial class onAnimationEndEventArgs : global::System.EventArgs {

	public onAnimationEndEventArgs (int param1, int param2)
	{
		this.param1 = param1;
		this.param2 = param2;
	}

	int param1;
	public int Param1 {
		get { return param1; }
	}

	int param2;
	public int Param2 {
		get { return param2; }
	}
}

The type 'onAnimationEndEventArgs' already contains a definition for 'param1'

This probably doesn't come up in a non-DIM world, but with DIM we hit it binding this interface:
https://developer.android.com/reference/android/animation/Animator.AnimatorListener