Appends the character to the text in the input field. This works as a filter:
only items containing this text will be displayed.
.TP
-Left/Right (Control-p/Control-n)
+Left/Right
Select the previous/next item.
.TP
-Tab (Control-i)
+Tab
Copy the selected item to the input field.
.TP
-Return (Control-j)
+Return
Confirm selection and quit (print the selected item to stdout).
.TP
-Shift-Return (Shift-Control-j)
+Shift-Return
Confirm selection and quit (print the text in the input field to stdout).
.TP
Escape (Control-[)
