Filter Control Extension duplicates values

[threatmix]

Hello, thanks for putting this on the internet. I started using it and it works very well. I think I found a bug in the 'sortSelectControl'. After the function returns, the options in my Select control duplicate. I think it is due to the $opts variable getting it's values from 2 controls. One of the select controls is part of the header, and the second gets set in the body section. when it runs the append, the options get duplicated.

I'm not sure how to fix this, if you can give me some info or documentation, I can try to fix it. Maybe even help with some of the other issues.

Thanks again.

Please read: https://github.com/wenzhixin/bootstrap-table/blob/develop/CONTRIBUTING.md#bug-reports and post issue to: https://github.com/wenzhixin/bootstrap-table/issues, thanks!