Extract Function: Allow to choose between function and property extraction

idea/testData/refactoring/extractFunction/asProperty/extractToClass.kt

@@ -0,0 +1,10 @@
+// EXTRACT_AS_PROPERTY
+
+class A(val n: Int = 1) {
+    val m: Int = 2
+    // SIBLING:
+    fun foo(): Int {
+        return <selection>m + n + 1</selection>
+    }
+}
+

idea/testData/refactoring/extractFunction/asProperty/extractToClass.kt.after

@@ -0,0 +1,15 @@
+// EXTRACT_AS_PROPERTY
+
+class A(val n: Int = 1) {
+    val m: Int = 2
+    // SIBLING:
+    fun foo(): Int {
+        return i
+    }
+
+    private val i: Int
+        get() {
+            return m + n + 1
+        }
+}
+

idea/testData/refactoring/extractFunction/asProperty/extractToFile.kt

@@ -0,0 +1,8 @@
+// EXTRACT_AS_PROPERTY
+
+val n: Int = 1
+
+// SIBLING:
+fun foo(): Int {
+    return <selection>n + 1</selection>
+}

idea/testData/refactoring/extractFunction/asProperty/extractToFile.kt.after

@@ -0,0 +1,13 @@
+// EXTRACT_AS_PROPERTY
+
+val n: Int = 1
+
+// SIBLING:
+fun foo(): Int {
+    return i
+}
+
+private val i: Int
+    get() {
+        return n + 1
+    }

idea/testData/refactoring/extractFunction/asProperty/extractToFunction.kt

@@ -0,0 +1,6 @@
+// EXTRACT_AS_PROPERTY
+
+fun foo(n: Int): Int {
+    // SIBLING:
+    return {<selection>n + 1</selection>}()
+}

idea/testData/refactoring/extractFunction/asProperty/extractToFunction.kt.conflicts

@@ -0,0 +1 @@
+Can't generate property: n + 1

idea/testData/refactoring/extractFunction/asProperty/extractWithParams.kt

@@ -0,0 +1,11 @@
+// PARAM_TYPES: kotlin.Int
+// PARAM_DESCRIPTOR: val m: kotlin.Int defined in foo
+// EXTRACT_AS_PROPERTY
+
+val n: Int = 1
+
+// SIBLING:
+fun foo(): Int {
+    val m = 1
+    return <selection>n + m + 1</selection>
+}

idea/testData/refactoring/extractFunction/asProperty/extractWithParams.kt.conflicts

@@ -0,0 +1 @@
+Can't generate property: n + m + 1