Given I am using Firefox, and I am browsing the details (overview) of a pull request and I have opened the "Checkout" dropdown, when I right-click in it to select the commands and copy them,
then this right-click should not close the dropdown

This bug was quite nasty to track down. It only happens in Firefox. Whenever someone right-clicks anywhere in the page, Firefox will also trigger a "click" event on document, for unknown reasons. Since angular-ui-bootstrap does not check on the kind of button being clicked, this closes the dropdown.