title: name space highlighting is not working in visual studio when using modules declaration instead of headers
body: <p>i'm working on C++20 standard but a weird scenario happens when I started using
  import statement instead of #include suddenly namespace highlighting is not working properly.</p>
  <p>working:
  <a href="https://i.stack.imgur.com/c0NYR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c0NYR.png" alt="working highlight" /></a></p>
  <p>not working:
  <a href="https://i.stack.imgur.com/VkaSB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VkaSB.png" alt="not working highlight" /></a></p>
  <p>I don't know what is going on here I suspect it highlights according to a different thing now</p>