exclude nested functions and classes at containingThis check

src/services/refactors/convertArrowFunctionOrFunctionExpression.ts

@@ -102,7 +102,9 @@ namespace ts.refactor.convertArrowFunctionOrFunctionExpression {
                 return;
             }
 
-            forEachChild(child, checkThis);
+            if (!isClassLike(child) && !isFunctionDeclaration(child) && !isFunctionExpression(child)) {
+                forEachChild(child, checkThis);
+            }
         });
 
         return containsThis;

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_Availability_Anon_nested_this.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+//// const zoo = /*x*/f/*w*/unction () {
+////     class Animal {
+////         weight = 42
+////         askWeight() { return this.weight }
+////     }
+////     const Insect = class {
+////         weight = 42
+////         askWeight() { return this.weight }
+////     }
+////     function callTaxi() { this.no = "054 xxx xx xx" }
+////     const callPizzaDelivery = function() { this.phone = "064 yyy yy yy"}
+//// };
+
+goTo.select("x", "w");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_Availability_Anon_this.ts

@@ -1,7 +1,9 @@
 /// <reference path='fourslash.ts' />
 
-//// const bar = 42;
-//// const foo = /*x*/f/*w*/unction() {return this.bar;};
+//// const foo = /*x*/f/*w*/unction() {
+////    this.bar = "F-Express";
+////    return this.bar;
+//// };
 
 goTo.select("x", "w");
 verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to named function");

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_Availability_Arrow_nested_this.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+//// const zoo = /*x*/(/*w*/) => {
+////     class Animal {
+////         weight = 42
+////         askWeight() { return this.weight }
+////     }
+////     const Insect = class {
+////         weight = 42
+////         askWeight() { return this.weight }
+////     }
+////     function callTaxi() { this.no = "054 xxx xx xx" }
+////     const callPizzaDelivery = function() { this.phone = "064 yyy yy yy"}
+//// };
+
+goTo.select("x", "w");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");