add wxShowEvent::IsShown() and wxIconizeEvent::IsIconized() instead of (now deprecated) GetShow() and Iconized() respectively (#978)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54320 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/window.h

@@ -2429,7 +2429,7 @@ public:
         @return @true if the window has been shown or hidden or @false if nothing
                  was done because it already was in the requested state.
 
-        @see IsShown(), Hide(), wxRadioBox::Show
+        @see IsShown(), Hide(), wxRadioBox::Show, wxShowEvent.
     */
     virtual bool Show(bool show = true);