Quick fix "Add remaining when branches" with some tests

idea/testData/quickfix/when/addRemainingBranchesBoolean.kt

@@ -0,0 +1,4 @@
+// "Add remaining branches" "true"
+fun test(b: Boolean) = wh<caret>en(b) {
+    false -> 0
+}

idea/testData/quickfix/when/addRemainingBranchesBoolean.kt.after

@@ -0,0 +1,5 @@
+// "Add remaining branches" "true"
+fun test(b: Boolean) = when(b) {
+    false -> 0
+    true -> throw AssertionError("")
+}

idea/testData/quickfix/when/addRemainingBranchesEnum.kt

@@ -0,0 +1,5 @@
+// "Add remaining branches" "true"
+enum class Color { R, G, B }
+fun test(c: Color) = wh<caret>en(c) {
+    Color.B -> 0xff
+}

idea/testData/quickfix/when/addRemainingBranchesEnum.kt.after

@@ -0,0 +1,7 @@
+// "Add remaining branches" "true"
+enum class Color { R, G, B }
+fun test(c: Color) = when(c) {
+    Color.B -> 0xff
+    Color.R -> throw AssertionError("")
+    Color.G -> throw AssertionError("")
+}

idea/testData/quickfix/when/addRemainingBranchesSealed.kt

@@ -0,0 +1,11 @@
+// "Add remaining branches" "true"
+sealed class Variant {
+    object Singleton : Variant()
+
+    class Something(val x: Int) : Variant()
+
+    object Another : Variant()
+}
+fun test(v: Variant?) = wh<caret>en(v) {
+    Variant.Singleton -> "s"
+}

idea/testData/quickfix/when/addRemainingBranchesSealed.kt.after

@@ -0,0 +1,14 @@
+// "Add remaining branches" "true"
+sealed class Variant {
+    object Singleton : Variant()
+
+    class Something(val x: Int) : Variant()
+
+    object Another : Variant()
+}
+fun test(v: Variant?) = when(v) {
+    Variant.Singleton -> "s"
+    is Variant.Something -> throw AssertionError("")
+    Variant.Another -> throw AssertionError("")
+    null -> throw AssertionError("")
+}