[PATCH] negative arg trimming

[Grisha Levit]

rl_trim_arg_from_keyseq fails to trim a negative argument entered with
universal-argument and fails to trim arguments if they have multiple
leading minus signs.

Also, when an argument is provided using universal-argument but without
typing any digits, rl_explicit_arg does not get set. Assuming that's
intentional, bash_execute_unix_command (and maybe other functions) can't
rely on tests like `if (count > 1 || rl_explicit_arg)' to check for an
argument since `count' is negative after `\C-u-'.

Example:

    bind 'set bind-tty-special-chars off'
    bind '"\C-u": universal-argument'
    bind -x '"\eX": "declare -p READLINE_ARGUMENT"'

Followed any of: "\e--\eX" "\C-u-\eX" "\C-u--\eX", etc. all result in:

    bash: bash_execute_unix_command: cannot find keymap for command

0001-negative-arg-trimming.patch
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