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. Reproducible: Always Steps to Reproduce: 1. start installer 2. try to expand branches with keyboard 3.
Assigning to a developer.
You can expand and collaps the tree branches with the '+' and '-' keys.