renamed wxWindow::IsVisible() to IsShownOnScreen() to fix name conflicts with other classes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41210 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -485,7 +485,7 @@ public:
 
     // returns true if the window is visible, i.e. IsShown() returns true
     // if called on it and all its parents up to the first TLW
-    virtual bool IsVisible() const;
+    virtual bool IsShownOnScreen() const;
 
         // get/set window style (setting style won't update the window and so
         // is only useful for internal usage)