Requiring a double click to show the tooltips isn't very intuitive, add
a callback to show the persistent tooltips on button release.
(Bitbake rev: 80af7e72a9404044910fca7f9265e66354f747a6)
Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>