Add when surrounder

idea/testData/codeInsight/surroundWith/when/enum.kt

@@ -0,0 +1,9 @@
+enum class MyEnum {
+    FIRST
+    SECOND
+}
+
+fun foo() {
+    val a = MyEnum.FIRST
+    <selection>a</selection>
+}

idea/testData/codeInsight/surroundWith/when/enum.kt.after

@@ -0,0 +1,12 @@
+enum class MyEnum {
+    FIRST
+    SECOND
+}
+
+fun foo() {
+    val a = MyEnum.FIRST
+    when(a) {
+        <caret> -> {
+        }
+    }
+}

idea/testData/codeInsight/surroundWith/when/multiExpression.kt

@@ -0,0 +1,4 @@
+fun foo() {
+    val a = "aa"
+    <selection>a.capitalize()</selection>
+}

idea/testData/codeInsight/surroundWith/when/multiExpression.kt.after

@@ -0,0 +1,9 @@
+fun foo() {
+    val a = "aa"
+    when(a.capitalize()) {
+        <caret> -> {
+        }
+        else -> {
+        }
+    }
+}

idea/testData/codeInsight/surroundWith/when/singleExpression.kt

@@ -0,0 +1,4 @@
+fun foo() {
+    val a = "aa"
+    <selection>a</selection>
+}

idea/testData/codeInsight/surroundWith/when/singleExpression.kt.after

@@ -0,0 +1,9 @@
+fun foo() {
+    val a = "aa"
+    when(a) {
+        <caret> -> {
+        }
+        else -> {
+        }
+    }
+}