Dropdown open/closed status cannot persist between renders

[jerrodheiser]

Describe the bug Re-renders of a Dropdown instance render with the Dropdown in a "closed" state. Current functionality does not provide for persistence of the Dropdown's open/closed status between render cycles.

Additional context

1. The desired behavior is that the parent component is given a means to control the Dropdowns open/closed status.
2. The following is an example where this behavior is not accessible:

• Dropdown content consists of a form element.
• Form element contains Checkbox elements, acting as toggleable filters.
• Checkbox values are defined pre-render. Therefore, Checkbox values are kept in parent component state.
• Checkbox onChange functions manipulate parent component state, which causes the Dropdown to re-render in a closed state.

3. Drawer/Modal are examples of components which take an isOpen prop, whcih would provide the desired functionality.

[silvalaura]

Note: only fix in v3. Release before December 2022

[silvalaura]

Not reproducible. This is addressed by using Dropdown form.