Plugins: can't access manage mode using keyboard

[alisterscott]

Originally raised by @enejb

Can't navigate using the keyboard into the manage mode on the plugin list view.

Feedback from @lancewillett

Seems like the span inside the anchor is what causes this — the keyboard focus on the span element and not the a element.

[enejb]

I was able to use the keyboard to successfully activate a plugin.

Feel free to reopen this if you still find it an issue.