Merge branch 'mac-native-focus-ring' of https://github.com/vslavik/wxWidgets

Draw wxTextCtrl focus ring natively on Mac.

Add wxWindow::EnableVisibleFocus() to explicitly control the focus ring
visibility if necessary.

See https://github.com/wxWidgets/wxWidgets/pull/2037

include/wx/window.h

@@ -767,6 +767,9 @@ public:
         // call this when the return value of AcceptsFocus() changes
     virtual void SetCanFocus(bool WXUNUSED(canFocus)) { }
 
+        // call to customize visible focus indicator if possible in the port
+    virtual void EnableVisibleFocus(bool WXUNUSED(enabled)) { }
+
         // navigates inside this window
     bool NavigateIn(int flags = wxNavigationKeyEvent::IsForward)
         { return DoNavigateIn(flags); }