Appends the character to the text in the input field. This works as a filter:
only items containing this text will be displayed.
.TP
-.B Left/Right
+.B Left/Right (Mod1-h/Mod1-l)
Select the previous/next item.
.TP
-.B PageUp/PageDown
+.B PageUp/PageDown (Mod1-k/Mod1-j)
Select the first item of the previous/next 'page' of items.
.TP
-.B Home/End
+.B Home/End (Mod1-g/Mod1-Shift-g)
Select the first/last item.
.TP
.B Tab (Control-i)