Tabs should use context when searching for panels

[petersendidit]

If a tabs href is a valid hash then tries to push that panel in to the panels array. This works great if the tabs are already in the document but if they are in a documentFragment then this fails.

The fix is easy. Just change this line in the _tabify function

self.panels = self.panels.add(self._sanitizeSelector(href));

to

self.panels = self.panels.add(self._sanitizeSelector(href), self.element);

Now it will handle the tabs not being part of the document yet.

[petersendidit]

Stack Overflow question that got me searching:

 http://stackoverflow.com/questions/3320791/why-are-some-jquery-ui-operations-unsuccessful-on-disembodied-dom-elements

[waldmang]

Same apply also to the $show element: $show = $(self._sanitizeSelector(this.hash));

should be

$show = $(self._sanitizeSelector(this.hash),self.element);

[scott.gonzalez]

Duplicate of #6710.