Selectmenu: Find label when <select> element has weird ID

[gabrielschulhof]

This issue is similar to #6052, except this breaks the page, because autoinit of the <select> element fails so the whole autoinit is torn down, leaving the loader in place forever.

[gabrielschulhof]

http://jsbin.com/IFolanOW/428/edit

[gabrielschulhof]

Boy! This issue reveals problems in the popup widget too. It's not sufficient to escape the ID when looking for the label. A custom selectmenu with a weird ID will cause a popup with a weird ID to be created, as well as a popup container, popup screen, listview, etc. The ID needs to be escaped in all selectors.

[gabrielschulhof]

Oh, and let's not forget pagecontainer. The dialog generated for the selectmenu when the menu is large also has an ID based on the ID of the selectmenu, so if the selectmenu's ID is weird, so will the dialog's be, and so will its data-url attribute.