Don't Center Popups if Size and Width aren't parsed

appshell/client_handler_win.cpp

@@ -123,6 +123,17 @@ bool ClientHandler::OnKeyEvent(CefRefPtr<CefBrowser> browser,
 
  void ClientHandler::ComputePopupPlacement(CefWindowInfo& windowInfo)
  {
+      // both must be set to work
+      if (windowInfo.width == CW_USEDEFAULT ||
+          windowInfo.height == CW_USEDEFAULT) {
+            // force both vals to be CW_USEDEFAULT in this
+            //  case because Windows doesn't correctly handle 
+            //  only one value being is supplied on input
+            windowInfo.width = CW_USEDEFAULT;
+            windowInfo.height = CW_USEDEFAULT;
+         return;
+     }
+
      RECT rectMainWnd;
      gMainWnd->GetWindowRect(&rectMainWnd);