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

diff --git a/src/mgl/dcclient.cpp b/src/mgl/dcclient.cpp
index 54ade252ffb760a6d05c6c011a298762cb6f73dd..e5b507cc92115a1373dff6c1be5e2a167d5b98e6 100644 (file)
--- a/src/mgl/dcclient.cpp
+++ b/src/mgl/dcclient.cpp
@@ -32,6 +32,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxClientDC)
 wxWindowDC::wxWindowDC(wxWindow *win) : m_wnd(win)
 {
     MGLDevCtx *dc = win->GetPaintMGLDC();
+
     if ( dc )
     {
         m_inPaintHandler = TRUE;
@@ -42,6 +43,10 @@ wxWindowDC::wxWindowDC(wxWindow *win) : m_wnd(win)
     else
     {
         m_inPaintHandler = FALSE;
+        
+        // VS: we have to update here so that screen's content is up-to-date
+        //     and blitting from wxWindowDC works as expected
+        win->Update();
 
         dc = new MGLDevCtx(MGL_wmBeginPaint(win->GetHandle()));