wp_dropdown_users() needs an 'id' parameter to allow it to work with the widgets API

[johnbillion]

It's not possible to use wp_dropdown_users() to display a dropdown of users on a widget administration screen (ie. in the form() function of the widget). The reason is that you cannot explicitly pass an 'id' parameter to the dropdown, which is a requirement of the AJAX functionality of the widget admin screen.

The problem is that wp_dropdown_users() uses the value of the 'name' parameter to populate both the name and the id of the dropdown. The AJAX functionality of the widget admin screen requires that the ID and name use explicit values from get_field_id() and get_field_name() respectively.

Patch coming up when I get a chance. There may also be other API functions that have the same problem.

[johnbillion]

Adds an 'id' parameter to wp_dropdown_users()

[johnbillion]

El patcho.

[johnbillion]

Adds an 'id' parameter to wp_dropdown_categories()

[johnbillion]

Additional patch whichs adds an ID parameter to wp_dropdown_categories() too.

[nacin]

(In [13553]) Add id argument to wp_dropdown_users() and wp_dropdown_categories(). props johnbillion. Ensure we're escaping name and id in wp_dropdown_users(). fixes #12132