fix code generation when using receiver bindings and @AssistedFactory

We'd get
foo = [email protected]@InjectAssistedFactoryComponent.provideFoo().bind

instead of
foo = [email protected]().bind

See #487 (comment)

Author: asapha

integration-tests/common/src/main/kotlin/me/tatarka/inject/test/Assisted.kt

@@ -19,7 +19,7 @@ class SomethingProvided()
 @Inject
 class FactoryAssistedBar(
     @Assisted val num: Int,
-    val foo: Foo,
+    val foo: IFoo,
     @Assisted val name: String,
     val provided: SomethingProvided,
 )
@@ -37,6 +37,12 @@ abstract class AssistedFactoryComponent {
     abstract val barFactory: AssistedBarFactory
     abstract val somethingDependant: SomethingDependantOnAssistedFactory
 
+    @Provides
+    fun provideFoo(): Foo = Foo()
+
+    val Foo.bind: IFoo
+        @Provides get() = this
+
     @get:Provides
     val name: SomethingProvided = SomethingProvided() // makes sure names don't clash with assisted params
 }

kotlin-inject-compiler/core/src/main/kotlin/me/tatarka/inject/compiler/TypeResultGenerator.kt

@@ -107,8 +107,9 @@ data class TypeResultGenerator(val options: Options, val implicitAccessor: Acces
                     }
                     add("%L.", accessorInScope)
                 }
-            } else if (implicitAccessor.isNotEmpty()) {
-                if (accessor == accessorInScope) {
+            } else if (implicitAccessor.isNotEmpty() && accessor == accessorInScope) {
+                // `receiver` will generate its own `this` expression below
+                if (receiver == null) {
                     add("this@%L.", className)
                 }
             }