menuconfig:inputbox: support navigate input position

This patch add support navigate input position *inside* the input
field with LEFT/RIGHT, so it is possible to modify the text in place.

Signed-off-by: Wang YanQing <[email protected]>
Tested-by: "Yann E. MORIN" <[email protected]>
Signed-off-by: "Yann E. MORIN" <[email protected]>
1 file changed