update the screen before gaining access to wxWindowDC
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13845 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@ -32,6 +32,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxClientDC)
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wxWindowDC::wxWindowDC(wxWindow *win) : m_wnd(win)
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{
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MGLDevCtx *dc = win->GetPaintMGLDC();
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if ( dc )
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{
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m_inPaintHandler = TRUE;
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@ -42,6 +43,10 @@ wxWindowDC::wxWindowDC(wxWindow *win) : m_wnd(win)
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else
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{
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m_inPaintHandler = FALSE;
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// VS: we have to update here so that screen's content is up-to-date
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// and blitting from wxWindowDC works as expected
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win->Update();
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dc = new MGLDevCtx(MGL_wmBeginPaint(win->GetHandle()));
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