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applets/kicker: fix backspace when searching
use a proper focus handling when switching back and forth from navigating items in the menu and searching by writing text.
- ItemListView knows about the search field and always forwards events to it
- when the listview is focused, if a non navigation key is pressed, just moves the active focus to the search field, the letter (or backspace, or right/left arrow) will already have been managed by the search field
- if the search field is focused, pressing a navigation key still transfers the focus to the listview