From Bugzilla Helper:
User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.2.16-22smp i686)
Installers tree widgets (monitor selection, mouse selection) doesn't
support keyboard collapsing/expanding . Unless I missed something. Ctrl,
Alt, Shift, space, enter (and combinations there of with the arrow keys)
will not expand.
Steps to Reproduce:
1. start installer
2. try to expand branches with keyboard
Assigning to a developer.
You can expand and collaps the tree branches with the '+' and '-' keys.