select_add_items_permission_option failed unexpectedly in a Selenium test https://github.com/galaxyproject/galaxy/runs/6130989843?check_suite_focus=true with this in the stack trace:
```
> raise exception_class(message, screen, stacktrace)
E selenium.common.exceptions.ElementClickInterceptedException: Message: element click intercepted: Element <ul class="multiselect__content" style="display: inline-block;">...</ul> is not clickable at point (324, 547). Other element would receive the click: <div data-v-5b55ce08="" class="col">...</div>
E (Session info: headless chrome=100.0.4896.75)
```
I think this means something was preventing it from being clickable - presumably a toastr message or something. This attempts to fix that issue two ways - by making the retry dec
orator a little more aggressive and by ensuring the element is in fact clickable before clicking it.
John Chilton