completion: complete tracked paths for "git checkout"

When completing arguments for "git checkout", _git_checkout()
delegates to __git_complete_refs(), which only completes revision
references.  This is good, as mixing revisions and paths in a single
list from which the user can choose is confusing.  However, if no
reference matches, or if "--" is given, _git_checkout() leaves
COMPREPLY empty.  Bash then falls back to the default filename
completion in $PWD.

This fails when "git -C <path>" is used, as $PWD is not the target
repository.

Update _git_checkout() to use __git_complete_index_file() when "--"
is present, or when revision reference completion yields no matching
candidates, so that tracked paths are offered as candidates.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions