Hover hack mangles a namespace named "hover"

[dmethvin]

On behalf of richhensel at gmail.com in #10882:

I was trying to add a custom event called 'xyz.hoverUrl.set' and it replaces that event with 'mouseleaveUrl'

The regex is too permissive in the hoverhack. Please make it more specific.

test case:

var a = {}; $(a).bind('xyz.hoverUrl.set', function(){return});

look at events for a and you will see 'mouseleaveUrl'

[Dave Methvin]

Fix #11021. There should be no mangling of the "hover" namespace.

Changeset: 4534db196bf9475c79f74d6b62ebc866c27d06d9