Deletes a previously defined sign {name}. This is similar to the :sign-undefine command. If {name} is not supplied, then deletes all the defined signs.

The one argument {list} can be used to undefine a list of signs. Each list item is the name of a sign.

Returns 0 on success and -1 on failure. For the one argument {list} call, returns a list of values one for each undefined sign.

Examples:

" Delete a sign named mySign
call sign_undefine("mySign")

" Delete signs 'sign1' and 'sign2'
call sign_undefine(["sign1", "sign2"])

" Delete all the signs
call sign_undefine()

Can also be used as a method:

GetSignlist()->sign_undefine()