Add selected class to "select all" option

[eryg-kai]

Previously it would be applied to everything except the "select all" option, making it impossible to style the "select all" option when it was selected.

[eryg-kai]

Are there any use cases this wouldn't work for? I feel like there must have been a reason to select on "input[selectItemName]" instead of simply "input", but I'm not sure what it is.

[wenzhixin]

Can you provide two jsfiddle(one to show the problem with the master branch, base #255, another to show the problem you fix with your changed code)?

[eryg-kai]

Of course!

Here is the master branch jsfiddle and the fixed jsfiddle.

In these examples I'm just changing the color of selected options so as not to clutter up the code. But it's more visually apparent if, for example, you are using custom checkboxes and need the selected class to visually select them.

For example: master branch jsfiddle and fixed jsfiddle.

[wenzhixin]

Thanks for your examples!