[PATCH 2/3] git-completion.bash: fix `git <args>... stash branch` bug

[Denton Liu <liu.denton@gmail.com>]

When completions are offered for `git stash branch<TAB>`, the user is
supposed to receive refs. This works in the case where the main git
command is called without arguments but if options are provided, such as
`git -C dir stash branch<TAB>`, then the `$cword -eq 3` provides
incorrect results.

Count the words relative to the first instance of "stash" so that we
ignore arguments to the main git command.

Unfortunately, this still does not work 100% correctly. For example, in
the case of something like `git -C stash stash branch<TAB>`, this will
incorrectly identify the first "stash" as the command. This seems to be
an edge-case that we can ignore, though, as other functions, such as
_git_worktree(), suffer from the same problem.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---
 contrib/completion/git-completion.bash | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index fe79f6b71c..da46f46e3c 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -3016,6 +3016,9 @@ _git_stash ()
 	local save_opts='--all --keep-index --no-keep-index --quiet --patch --include-untracked'
 	local subcommands='push list show apply clear drop pop create branch'
 	local subcommand="$(__git_find_on_cmdline "$subcommands save")"
+	local stash_idx="$(__git_find_on_cmdline --show-idx stash)"
+	stash_idx="${stash_idx% *}"
+
 	if [ -z "$subcommand" -a -n "$(__git_find_on_cmdline "-p")" ]; then
 		subcommand="push"
 	fi
@@ -3060,7 +3063,7 @@ _git_stash ()
 	branch,--*)
 		;;
 	branch,*)
-		if [ $cword -eq 3 ]; then
+		if [ $((cword - stash_idx)) -eq 2 ]; then
 			__git_complete_refs
 		else
 			__gitcomp_nl "$(__git stash list \
-- 
2.31.0.rc2.261.g7f71774620