add some forward-compatibility functions to allow writing code compiling with both 2.8 and trunk without deprecation warnings (closes #10629)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@59768 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -1442,6 +1442,9 @@ public:
 
     void SetShow(bool show) { m_show = show; }
     bool GetShow() const { return m_show; }
+#if wxABI_VERSION >= 20811
+    bool IsShown() const { return GetShow(); }
+#endif
 
     virtual wxEvent *Clone() const { return new wxShowEvent(*this); }
 
@@ -1468,7 +1471,9 @@ public:
 
     // return true if the frame was iconized, false if restored
     bool Iconized() const { return m_iconized; }
-
+#if wxABI_VERSION >= 20811
+    bool IsIconized() const { return Iconized(); }
+#endif
     virtual wxEvent *Clone() const { return new wxIconizeEvent(*this); }
 
 protected: