problem in cursor position in back and clear

[omidpaydar]

if "keypadOnly" config set "false" for any time if we click back btn on keyboard, fild is unfocus and for handle back click we force to focus in field and again click back.
for delete any character we forced this steps.
i fixed this problem by get position in first line at method (_backValue) and decrease 1 from start and end and in end of method set this position for field.
for _clearValue method i focus in field end of method.