Security Level: All-users
When using the drop-down list filter style on a filter in layered navigation, the drop-down is unusable, as simply clicking on it to open the drop-down list causes the page to refresh. It's also unusable through the use of the keyboard.
I believe the problem is with the default theme's blocklayer module, in the blocklayered.js file (themes/default-bootstrap/js/modules/blocklayered/blocklayered.js).
On line 45, the drop-down is included alongside the checkbox and radio-button handling the click event:
Instead, it should be handled separately with the 'change' event, like so:
The use of $('body') seems necessary as using $(document) fails to work here.