Add quickfix "Add 'init' keyword in whole project"

idea/testData/quickfix/migration/addInitKeywordMultiple.after.data.Sample.kt

@@ -0,0 +1,64 @@
+annotation class Ann3
+annotation class Ann4
+
+class D {
+    Ann3 init {
+
+    }
+    Ann4 init {
+        class Q {
+            init {
+
+            }
+        }
+    }
+}
+
+class E {
+    companion object {
+        init {
+
+        }
+        init {}
+    }
+}
+
+fun foo() = 1
+class F {
+    val a1 = foo()
+
+    init {
+
+    }
+
+    val a2 = foo()
+
+    init {
+
+    }
+
+    val a3 = foo(); // el
+    /* abc */init {
+
+    }
+
+    val a4 = foo() // el
+
+    ;/* abc */
+
+    init {
+
+    }
+
+    val a5 = foo()
+    /* abc */
+
+    init {
+
+    }
+
+    val a6 = foo();
+    init {
+
+    }
+}

idea/testData/quickfix/migration/addInitKeywordMultiple.after.kt

@@ -0,0 +1,37 @@
+// "Add 'init' keyword in whole project" "true"
+
+annotation class Ann1
+annotation class Ann2
+
+class A {
+    Ann1 Ann2 init {
+        class Q {
+            init {
+
+            }
+            Ann2 init {
+
+            }
+        }
+    }
+    Ann1 init {
+
+    }
+}
+
+class B {
+    Ann1 Ann2 init {
+        class Q {
+            init {
+
+            }
+            Ann2 init {
+
+            }
+        }
+    }
+    init {
+
+    }
+}
+

idea/testData/quickfix/migration/addInitKeywordMultiple.before.Main.kt

@@ -0,0 +1,37 @@
+// "Add 'init' keyword in whole project" "true"
+
+annotation class Ann1
+annotation class Ann2
+
+class A {
+    Ann1 Ann2 <caret>{
+        class Q {
+            {
+
+            }
+            Ann2 {
+
+            }
+        }
+    }
+    Ann1 {
+
+    }
+}
+
+class B {
+    Ann1 Ann2 {
+        class Q {
+            init {
+
+            }
+            Ann2 {
+
+            }
+        }
+    }
+    {
+
+    }
+}
+

idea/testData/quickfix/migration/addInitKeywordMultiple.before.data.Sample.kt

@@ -0,0 +1,60 @@
+annotation class Ann3
+annotation class Ann4
+
+class D {
+    Ann3 init {
+
+    }
+    Ann4 {
+        class Q {
+            {
+
+            }
+        }
+    }
+}
+
+class E {
+    companion object {
+        init {
+
+        }
+        {}
+    }
+}
+
+fun foo() = 1
+class F {
+    val a1 = foo();
+
+    {
+
+    }
+
+    val a2 = foo()
+
+    ;{
+
+    }
+
+    val a3 = foo(); // el
+    /* abc */{
+
+    }
+
+    val a4 = foo() // el
+
+    ;/* abc */{
+
+    }
+
+    val a5 = foo()
+    /* abc */;{
+
+    }
+
+    val a6 = foo();
+    init {
+
+    }
+}