Replace if with when: fix behavior on 'else if' #KT-4645 Fixed

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf.kt

@@ -0,0 +1,9 @@
+fun test(n: Int): String {
+    return if (n == 0)
+        "zero"
+    else <caret>if (n == 1)
+        "one"
+    else if (n == 2)
+        "two"
+    else "unknown"
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf.kt.after

@@ -0,0 +1,8 @@
+fun test(n: Int): String {
+    return <caret>when (n) {
+        0 -> "zero"
+        1 -> "one"
+        2 -> "two"
+        else -> "unknown"
+    }
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf2.kt

@@ -0,0 +1,11 @@
+fun test(n: Int): String {
+    return if (n == 0) {
+        "zero"
+    } else if (n == 1) {
+        "one"
+    } else <caret>if (n == 2) {
+        "two"
+    } else {
+        "unknown"
+    }
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf2.kt.after

@@ -0,0 +1,8 @@
+fun test(n: Int): String {
+    return <caret>when (n) {
+        0 -> "zero"
+        1 -> "one"
+        2 -> "two"
+        else -> "unknown"
+    }
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf3.kt

@@ -0,0 +1,13 @@
+fun test(b: Boolean, n: Int): String {
+    return if (b) {
+        if (n == 0)
+            "zero"
+        else if (n == 1)
+            "one"
+        else <caret>if (n == 2)
+            "two"
+        else "unknown"
+    } else {
+        ""
+    }
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/onElseIf3.kt.after

@@ -0,0 +1,12 @@
+fun test(b: Boolean, n: Int): String {
+    return if (b) {
+        <caret>when (n) {
+            0 -> "zero"
+            1 -> "one"
+            2 -> "two"
+            else -> "unknown"
+        }
+    } else {
+        ""
+    }
+}