Extract Function: Support extraction of expressions in delegation

specifiers

idea/testData/refactoring/extractFunction/delegation/delegationByExpression.kt

@@ -0,0 +1,7 @@
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+trait T
+
+class A(a: Int, b: Int): T
+
+class B(a: Int, b: Int): T by A(<selection>a + b</selection>, a - b)

idea/testData/refactoring/extractFunction/delegation/delegationByExpression.kt.after

@@ -0,0 +1,11 @@
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+trait T
+
+class A(a: Int, b: Int): T
+
+class B(a: Int, b: Int): T by A(i(a, b), a - b)
+
+fun i(a: Int, b: Int): Int {
+    return a + b
+}

idea/testData/refactoring/extractFunction/delegation/delegationByExpressionFull.kt

@@ -0,0 +1,6 @@
+// PARAM_TYPES: T
+trait T
+
+class A(a: Int, b: Int): T
+
+class B(t: T): T by <selection>t</selection>

idea/testData/refactoring/extractFunction/delegation/delegationByExpressionFull.kt.after

@@ -0,0 +1,10 @@
+// PARAM_TYPES: T
+trait T
+
+class A(a: Int, b: Int): T
+
+class B(t: T): T by t(t)
+
+fun t(t: T): T {
+    return t
+}

idea/testData/refactoring/extractFunction/delegation/delegationBySuperCall.kt

@@ -0,0 +1,5 @@
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+open class A(a: Int, b: Int)
+
+class B(a: Int, b: Int): A(<selection>a + b</selection>, a - b)

idea/testData/refactoring/extractFunction/delegation/delegationBySuperCall.kt.after

@@ -0,0 +1,9 @@
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+open class A(a: Int, b: Int)
+
+class B(a: Int, b: Int): A(i(a, b), a - b)
+
+fun i(a: Int, b: Int): Int {
+    return a + b
+}