Fix 47746 - Missing properties quickfix does not handle generic param…

…eters (#47790)

* Added test

* Added extra test case

tests/cases/fourslash/codeFixAddMissingProperties17.ts

@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+////interface Foo<T> {
+////    foo(): T;
+////}
+////[|const x: Foo<string> = {};|]
+
+verify.codeFix({
+  index: 0,
+  description: ts.Diagnostics.Add_missing_properties.message,
+  newRangeContent: `const x: Foo<string> = {
+    foo: function(): string {
+        throw new Error("Function not implemented.");
+    }
+};`,
+});

tests/cases/fourslash/codeFixAddMissingProperties18.ts

@@ -0,0 +1,20 @@
+/// <reference path='fourslash.ts' />
+
+////interface Bar {
+////    a: number;
+////}
+////
+////interface Foo<T, U> {
+////    foo(a: T): U;
+////}
+////[|const x: Foo<string, Bar> = {};|]
+
+verify.codeFix({
+  index: 0,
+  description: ts.Diagnostics.Add_missing_properties.message,
+  newRangeContent: `const x: Foo<string, Bar> = {
+    foo: function(a: string): Bar {
+        throw new Error("Function not implemented.");
+    }
+};`,
+});