I plan to have a few different ways to view and select xfstests runs, so
I use an Gtk.Stack() and Gtk.StackSwitcher() to animate switching
between the different sidebar pages.
Signed-off-by: Anna Schumaker <anna@nowheycreamery.com>
This will be placed in the sidebar to display our tree of potential runs
to view. I do this as its own widget so we can reuse it for different
sidebar views.
Signed-off-by: Anna Schumaker <anna@nowheycreamery.com>