well as corresponding classes for applications and documents that inherit from
them.
Use half the height of the sideshow in the overlay mode for the
AppDisplay, and the other half for the DocDisplay.
Enable moving the selection between the two displays by using up and down arrow keys.
Enable activating any item by clicking on it, in addition to activating the currently selected item by pressing Enter.
Apply search entry content to both sets of items.
svn path=/trunk/; revision=132
