From 99e03ca0dab9a01426947426267fa4cb2d904cff Mon Sep 17 00:00:00 2001
From: Jonas Bernoulli <jonas@bernoul.li>
Date: Mon, 27 Nov 2023 17:32:28 +0100
Subject: Fix color lookup for non-suffixes

There actually is a binding for [nil], in `transient--predicate-map',
and it's not always what we need when determining the color (and thus
pre-command) for non-suffixes (via `transient--separator-line').
---
 lisp/transient.el | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/lisp/transient.el b/lisp/transient.el
index ca3f02b..7b43df9 100644
--- a/lisp/transient.el
+++ b/lisp/transient.el
@@ -2526,9 +2526,10 @@ nil) then do nothing."
         (setq this-command 'transient-undefined)))
     transient--stay))
 
-(defun transient--get-pre-command (cmd &optional suffix-only)
-  (or (lookup-key transient--predicate-map (vector cmd))
-      (and (not suffix-only)
+(defun transient--get-pre-command (&optional cmd enforce-type)
+  (or (and (not (eq enforce-type 'non-suffix))
+           (lookup-key transient--predicate-map (vector cmd)))
+      (and (not (eq enforce-type 'suffix))
            (transient--resolve-pre-command
             (oref transient--prefix transient-non-suffix)
             t))))
@@ -3535,10 +3536,11 @@ have a history of their own.")
 (defun transient--separator-line ()
   (and (eq transient-mode-line-format 'line)
        window-system
-       (let ((face
-              `(,@(and (>= emacs-major-version 27) '(:extend t))
-                :background ,(or (face-foreground (transient--key-face) nil t)
-                                 "#gray60"))))
+       (let ((face `(,@(and (>= emacs-major-version 27) '(:extend t))
+                     :background
+                     ,(or (face-foreground (transient--key-face nil 'non-suffix)
+                                           nil t)
+                          "#gray60"))))
          (concat (propertize "__" 'face face 'display '(space :height (1)))
                  (propertize "\n" 'face face 'line-height t)))))
 
@@ -3889,12 +3891,13 @@ If the OBJ's `key' is currently unreachable, then apply the face
         (funcall face)
       face)))
 
-(defun transient--key-face (&optional cmd)
+(defun transient--key-face (&optional cmd enforce-type)
   (or (and transient-semantic-coloring
            (not transient--helpp)
            (not transient--editp)
            (or (and cmd (get cmd 'transient-face))
-               (get (transient--get-pre-command cmd) 'transient-face)))
+               (get (transient--get-pre-command cmd enforce-type)
+                    'transient-face)))
       (if cmd 'transient-key 'transient-key-noop)))
 
 (defun transient--key-unreachable-p (obj)
-- 
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