Move wxMSW wxTextCtrl::GetDefaultAttributes() to wxTextCtrlBase.

This commit doesn't introduce any changes in the control behaviour, it simply
moves the existing method to the base class because it is not MSW-specific.

Also implement wxTextCtrlBase::GetClassDefaultAttributes() because if a class
implements GetDefaultAttributes() it should implement it as well.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62803 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/textctrl.cpp

@@ -2197,23 +2197,6 @@ void wxTextCtrl::OnSetFocus(wxFocusEvent& event)
     event.Skip();
 }
 
-// ----------------------------------------------------------------------------
-// Default colors for MSW text control
-//
-// Set default background color to the native white instead of
-// the default wxSYS_COLOUR_BTNFACE (is triggered with wxNullColour).
-// ----------------------------------------------------------------------------
-
-wxVisualAttributes wxTextCtrl::GetDefaultAttributes() const
-{
-    wxVisualAttributes attrs;
-    attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
-    attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT);
-    attrs.colBg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW); //white
-
-    return attrs;
-}
-
 // the rest of the file only deals with the rich edit controls
 #if wxUSE_RICHEDIT