in addition to wxWinCE, also set background colour explicitly for GTK1, otherwise it is black there

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43371 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/collpaneg.cpp

@@ -86,7 +86,9 @@ bool wxGenericCollapsiblePane::Create(wxWindow *parent,
     m_sz->Add(m_pStaticLine, 1, wxALIGN_CENTER|wxLEFT|wxRIGHT, GetBorder());
 #endif
 
-#ifdef __WXWINCE__
+    // FIXME: at least under wxCE and wxGTK1 the background is black if we don't do
+    //        this, no idea why...
+#if defined(__WXWINCE__) || (defined(__WXGTK__) && !defined(__WXGTK20__))
     SetBackgroundColour(parent->GetBackgroundColour());
 #endif