Fix TTY colors breakage by 'clear-face-cache'

Without examining the right frame, 'tty-color-24bit' was erroneously
treating a GUI frame as a 24-bit TTY frame.
* lisp/term/tty-colors.el (tty-color-24bit): Accept optional
argument DISPLAY and pass it to display-color-cells.  Doc fix.
(tty-color-define, tty-color-desc): Pass the FRAME argument to
tty-color-24bit.  (Bug#32072)

1 files changed, 8 insertions, 6 deletions

diff --git a/lisp/term/tty-colors.el b/lisp/term/tty-colors.el
index ab9149e6b42..a776c830a25 100644
--- a/lisp/term/tty-colors.el
+++ b/lisp/term/tty-colors.el
@@ -824,10 +824,12 @@ A canonicalized color name is all-lower case, with any blanks removed."
         (replace-regexp-in-string " +" "" (downcase color))
       color)))
 
-(defun tty-color-24bit (rgb)
-  "Return pixel value on 24-bit terminals. Return nil if RGB is
-nil or not on 24-bit terminal."
-  (when (and rgb (= (display-color-cells) 16777216))
+(defun tty-color-24bit (rgb &optional display)
+  "Return 24-bit color pixel value for RGB value on DISPLAY.
+DISPLAY can be a display name or a frame, and defaults to the
+selected frame's display.
+If DISPLAY is not on a 24-but TTY terminal, return nil."
+  (when (and rgb (= (display-color-cells display) 16777216))
     (let ((r (lsh (car rgb) -8))
           (g (lsh (cadr rgb) -8))
           (b (lsh (nth 2 rgb) -8)))
@@ -850,7 +852,7 @@ If FRAME is not specified or is nil, it defaults to the selected frame."
       (error "Invalid specification for tty color \"%s\"" name))
   (tty-modify-color-alist
    (append (list (tty-color-canonicalize name)
-                 (or (tty-color-24bit rgb) index))
+                 (or (tty-color-24bit rgb frame) index))
            rgb)
    frame))
 
@@ -1026,7 +1028,7 @@ might need to be approximated if it is not supported directly."
           (or (assoc color (tty-color-alist frame))
               (let ((rgb (tty-color-standard-values color)))
                 (and rgb
-                     (let ((pixel (tty-color-24bit rgb)))
+                     (let ((pixel (tty-color-24bit rgb frame)))
                        (or (and pixel (cons color (cons pixel rgb)))
                            (tty-color-approximate rgb frame)))))))))