Added wxSHOW_EFFECT_NONE.

Calling Show/HideWithEffect() with this effect is the same as calling just the normal Show/Hide().

This is convenient as it allows to use the same API, whether with effects or without them.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62267 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -724,6 +724,9 @@ wxWindowMSW::MSWShowWithEffect(bool show,
                                wxShowEffect effect,
                                unsigned timeout)
 {
+    if ( effect == wxSHOW_EFFECT_NONE )
+        return Show(show);
+
     if ( !wxWindowBase::Show(show) )
         return false;