Type of diff cannot be selected by keyboard

Issue Summary

Disabled users who cannot use a mouse may rely on using the keyboard for navigating UI elements. When looking at a commit in the Bitbucket Server UI and opening the [...] menu, the keyboard can be used to navigate through the list of display options, however the type of diff (unified vs side-by-side) cannot be selected via keyboard.

Steps to Reproduce

1. Navigate to a commit
2. Open the [...] menu
3. Use the arrow keys on the keyboard to navigate through the available options

Expected Results

You can navigate through all options in that menu

Actual Results

You can navigate through the bottom 5 options but not the first two (the type of diff)

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available