Bug: git completion: __git_ignore_line ignores complete branch

[Daniel Hahler <genml+zsh-workers@thequod.de>]

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__git_ignore_line_inside_arguments seems to be responsible for an error when trying
to complete an already complete branch.

E.g. "git branch -D branch<tab>" results in:
 -- no matches found: `branch-name' --

But "git branch -D branc<tab>" will complete "branch".

This is the function:

(( $+functions[__git_ignore_line] )) ||
__git_ignore_line () {
  declare -a ignored
  ignored=()
  ((CURRENT > 1)) &&
    ignored+=(${line[1,CURRENT-1]//(#m)[\[\]()\\*?#<>~\^]/\\$MATCH})
  ((CURRENT < $#line)) &&
    ignored+=(${line[CURRENT+1,-1]//(#m)[\[\]()\\*?#<>~\^]/\\$MATCH})
  $* -F ignored
}

(( $+functions[__git_ignore_line_inside_arguments] )) ||
__git_ignore_line_inside_arguments () {
  declare -a compadd_opts

  zparseopts -D -E -a compadd_opts V: J: 1 2 n f X: M: P: S: r: R: q F:

  __git_ignore_line $* $compadd_opts
}

And it is used like this in _git-branch:

  dependent_deletion_args+='*: :__git_ignore_line_inside_arguments __git_branch_names'

The problem is that it will ignore the current word, "branch", but should do so probably
only if it is not being completed currently, i.e. has a space at the end?!

It works when completing "branc", because then only "branc" will be ignored.

$line in the context of __git_ignore_line will be the part after "git branch -D", and $CURRENT will be 3.  That seems to be off?!

For the case at hand, using ${line[1,CURRENT-3]//...} seems to fix it, but probably
an index matching the position in $line, and then -1 should be used?!


Regards,
Daniel.
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