KT-4027 No type name completion in an incomplete generic extension function declaration

KT-2940 No completion in the receiver type argument position

 #KT-4027 Fixed
 #KT-2940 Fixed

idea/testData/completion/basic/common/GenericExtensionFunReceiver1.kt

@@ -0,0 +1,8 @@
+fun foo() {}
+
+fun <T> S<caret>
+
+// INVOCATION_COUNT: 1
+// EXIST: String
+// EXIST: Set
+// ABSENT: foo

idea/testData/completion/basic/common/GenericExtensionFunReceiver2.kt

@@ -0,0 +1,11 @@
+class Foo{}
+
+fun foo() {}
+
+fun <T> <caret>
+
+// INVOCATION_COUNT: 1
+// EXIST: Foo
+// EXIST: String
+// EXIST: Set
+// ABSENT: foo

idea/testData/completion/basic/common/GenericExtensionFunTypeArgument.kt

@@ -0,0 +1,8 @@
+fun Strange(){}
+
+fun Annotations<S<caret>
+
+// INVOCATION_COUNT: 1
+// EXIST: String
+// EXIST: Set
+// ABSENT: Strange

idea/testData/completion/basic/common/GenericExtensionFunTypeArgument2.kt

@@ -0,0 +1,7 @@
+fun Strange(){}
+
+fun Map<() -> Unit, Str<caret>
+
+// INVOCATION_COUNT: 0
+// EXIST: String
+// ABSENT: Strange