Even though dwim is enabled by default, it will never be done when
--detached is specified. If you force "-d --guess" you will get an error
because --guess then implies -c which cannot be used with -d. So we can
disable dwim in "switch -d". It makes the completion list in this case a
bit shorter.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 contrib/completion/git-completion.bash | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 58d18d41a2..656e49710e 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2183,6 +2183,10 @@ _git_switch ()
                fi
                if [ -z "$(__git_find_on_cmdline "-d --detach")" ]; then
                        only_local_ref=y
+               else
+                       # --guess --detach is invalid combination, no
+                       # dwim will be done when --detach is specified
+                       track_opt=
                fi
                if [ $only_local_ref = y -a -z "$track_opt" ]; then
                        __gitcomp_direct "$(__git_heads "" "$cur" " ")"
-- 
2.22.0.rc0.322.g2b0371e29a

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