Registering properties of custom interfaces breaks code generation

[exigow]

Hi,

this combination produces invalid code:

1. class extending Node
2. such class implementing interface with var property
3. such property with @Export annotation

I think this scenario should be supported. You often want to create abstraction with common property across different implementations (for example, "game object" and "health" value). Changing this value in editor should be also available.

Steps to reproduce

Version: 0.5.1-3.5.1

interface TestInterface {
	var testProperty: String
}

@RegisterClass
class TestNode : Node(), TestInterface {
	@Export
	@RegisterProperty
	override var testProperty: String = ""
}

Result

Compilation fails. Class in build/generated/ contains redundant override keyword. Removing override manually seems to work but code is replaced on next build task.

public open class TestNodeRegistrar : ClassRegistrar {
	public open override val testPropertyDefaultValueProvider: () -> String = { """""" }
	public override fun register(registry: ClassRegistry): Unit {
		with(registry) {
			registerClass<TestNode>("res://src/main/kotlin/test/TestNode.kt", "godot.Node", TestNode::class, false, "Node", "test_TestNode") {
				constructor(KtConstructor0(::TestNode))
				function(TestNode::_ready, NIL, KtFunctionArgument(NIL, "kotlin.Unit"), DISABLED.id.toInt())
				property(TestNode::testProperty, STRING, STRING, "kotlin.String", NONE, "", testPropertyDefaultValueProvider, true, DISABLED.id.toInt())
			}
		}
	}
}

PS: Thanks for working on this binding. It makes me happy by allowing me to use Godot with Kotlin.

[chippmann]

Changed the title to the "real" problem.
Reason for the problem: I handle interfaces as abstract classes in the entry generation by mistake.
Will fix it asap.

[exigow]

Thanks, @chippmann.