title: WM_SIZE doesnt work as expected
body: <p>I have a problem with <code>WM_SIZE</code>. I want to capture it using <code>PeekMessage</code> (not <code>WndProc</code>). <code>PeekMessage</code> never receives <code>WM_SIZE</code>, so I post extra user message to window to capture it with <code>PeekMessage</code> like this (code from <code>WnProc</code>) :</p>
  
  <pre><code>case WM_SIZE:
    PostMessageW(hwnd, WM_USER + 1, wParam, lParam);
    break;
  </code></pre>
  
  <p>The problem is I receive <code>WM_USER + 1</code> using <code>PeekMessage</code> only when window is maximized or restored. No message when window is resized by its thick frame (I receive <code>WM_SIZE</code> in <code>WndProc</code> though).</p>