Spelling code fix:suggestions from apparent type

The code fix for spelling correction needs to provide suggestions based
on the apparent type since sometimes the type at a location will be a type
parameter. One such example is `this`.

Fixes #16744

Author: sandersn

src/services/codefixes/fixSpelling.ts

@@ -16,7 +16,7 @@ namespace ts.codefix {
         const checker = context.program.getTypeChecker();
         let suggestion: string;
         if (node.kind === SyntaxKind.Identifier && isPropertyAccessExpression(node.parent)) {
-            const containingType = checker.getTypeAtLocation(node.parent.expression);
+            const containingType = checker.getApparentType(checker.getTypeAtLocation(node.parent.expression));
             suggestion = checker.getSuggestionForNonexistentProperty(node as Identifier, containingType);
         }
         else {

tests/cases/fourslash/codeFixCorrectSpelling.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+////[|class C {
+////    state = 'hi'
+////    doStuff() {
+////        this.start;
+////    }
+////}|]
+
+verify.rangeAfterCodeFix(`class C {
+    state = 'hi'
+    doStuff() {
+        this.state;
+    }
+}`, /*includeWhiteSpace*/false, /*errorCode*/ undefined, /*index*/ 2);