Created by: shehi
This change, just make sure the dropdown-backdrop which was introduced during "touchstart" gets its event handler for "touchend" event, rather than "click" one (which is broken due to delegation bug anyway). When the event is bound on "click", once all dropdowns are closed, it triggers the original initiator again and dropdown gets reopened. With my solution, backdrop is removed successfully and dropdowns close fine.
I realize you guys stopped supporting TWBS 3: please consider accepting this fix in, as I have a project with uses v3 and has unpredictable situation with touch-events. Dropdowns just remain open.
https://github.com/silviomoreto/bootstrap-select/issues/1558
Apparently, the related line in the code was put into if conditional with commit f37b351288883cca4ea435827b10fe6d8475dc6e, but while doing so, whereas the condition contains ontouchstart rule, event itself wasn't updated to some touch-event, it remained as click.