duilib的caption上的Edit无法激活

当窗口设置标题栏时，鼠标等控件可以相应，edit无法响应。

主要和WindowImplBase::OnNcHitTest 虚函数有关。

LRESULT WindowImplBase::OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
POINT pt; pt.x = GET_X_LPARAM(lParam); pt.y = GET_Y_LPARAM(lParam);
::ScreenToClient(*this, &pt);

RECT rcClient;
::GetClientRect(*this, &rcClient);

if( !::IsZoomed(*this) )
{
RECT rcSizeBox = m_PaintManager.GetSizeBox();
if( pt.y < rcClient.top + rcSizeBox.top )
{
if( pt.x < rcClient.left + rcSizeBox.left ) return HTTOPLEFT;
if( pt.x > rcClient.right - rcSizeBox.right ) return HTTOPRIGHT;
return HTTOP;
}
else if( pt.y > rcClient.bottom - rcSizeBox.bottom )
{
if( pt.x < rcClient.left + rcSizeBox.left ) return HTBOTTOMLEFT;
if( pt.x > rcClient.right - rcSizeBox.right ) return HTBOTTOMRIGHT;
return HTBOTTOM;
}

if( pt.x < rcClient.left + rcSizeBox.left ) return HTLEFT;
if( pt.x > rcClient.right - rcSizeBox.right ) return HTRIGHT;
}

RECT rcCaption = m_PaintManager.GetCaptionRect();
if( pt.x >= rcClient.left + rcCaption.left && pt.x < rcClient.right - rcCaption.right
&& pt.y >= rcCaption.top && pt.y < rcCaption.bottom ) {
CControlUI* pControl = static_cast<CControlUI*>(m_PaintManager.FindControl(pt));
if( pControl && _tcsicmp(pControl->GetClass(), _T("ButtonUI")) != 0 &&
_tcsicmp(pControl->GetClass(), _T("OptionUI")) != 0 &&
_tcsicmp(pControl->GetClass(), _T("TextUI")) != 0 &&
_tcsicmp(pControl->GetClass(), _T("SliderUI")) != 0)
return HTCAPTION;
}

return HTCLIENT;
}

在返回caption区域时，只排除了ButtonUI、OptionUI、TextUI、SliderUI四种控件。

所以解决办法是：在派生自WindowImplBase的对话框中重写OnNcHitTest，将EditUI加进去即可。