Filter text clears on state change

[darkestmon]

To replicate:

1. Create a multiselect with filter
2. Add a setState on onChange
3. Run
4. Write something on the filter box
5. Click an item
   Expected: multiselect should still be filtered
   What happens: filter is cleared and multiselect lists all items

I'm guessing since the setState forces a render of the component, the filter box is back to default empty state.

Tried a work around stated in the bootstrap-multiselect site:
http://davidstutz.de/bootstrap-multiselect/#further-examples

$('#file-box-wrapper li.multiselect-filter input').val(this.filterKeyword).trigger('keydown');

text is placed in the filterbox but it does not update the list.

[darkestmon]

On a deeper look, looks like bootstrap-multiselect itself doesn't allow initialization of filter box. This might be a bigger issue to fix.