C++: Resolve function-scope typedef inside lambda

Use-case:
struct Foo { int bar; };

void func()
{
    typedef Foo F;
    []() {
        F f;
        f.bar; // bar not highlighted
    };
}

Change-Id: Ifaee2d125931d993acad69f03031a675c6180858
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/libs/cplusplus/TypeResolver.cpp

@@ -154,6 +154,13 @@ QList<LookupItem> TypeResolver::typedefsFromScopeUpToFunctionScope(const Name *n
             }
         }
         enclosingBlockScope = block->enclosingScope();
+        if (enclosingBlockScope) {
+            // For lambda, step beyond the function to its enclosing block
+            if (Function *enclosingFunction = enclosingBlockScope->asFunction()) {
+                if (!enclosingFunction->name())
+                    enclosingBlockScope = enclosingBlockScope->enclosingScope();
+            }
+        }
     }
     return results;
 }