Workaround iOS bug where clicking Menu can focus/click an input/button behind it. Fixes #17816.
Workaround iOS bug where clicking Menu can focus/click an input/button behind it.
Fixes #17816.

Cherry picked from dijit:

- e9a09987211acd8b3b59ed2359b4d21fef099913
- 7efe39728726534c59abc5e82afcff4e3c1ade8c
- af2b3c2d13a83aaf0a217eac99e674a1ae253f96

harbalk/delite,Sam-Cummins/delite,kitsonk/delite,kitsonk/delite,Sam-Cummins/delite,harbalk/delite