Fix up previous change for column/line spec mechanism in the mode line

* lisp/bindings.el (column-number-indicator-zero-based): Make
obsolete (bug#28648).
(mode-line-position-column-line-format): New variable.
(mode-line-position--column-line-properties): New const.
(mode-line-position): Use it.

doc/lispref/modes.texi

@@ -2177,11 +2177,18 @@ number.
 The format used to display column numbers when
 @code{column-number-mode} (@pxref{Optional Mode Line,,, emacs, The GNU
 Emacs Manual}) is switched on.  @samp{%c} in the format will be
-replaced with the line number, and this is zero-based if
+replaced with the column number, and this is zero-based if
 @code{column-number-indicator-zero-based} is non-@code{nil}, and
 one-based if @code{column-number-indicator-zero-based} is @code{nil}.
 @end defvar
 
+@defvar mode-line-position-column-line-format
+The format used to display column numbers when both
+@code{line-number-mode} and @code{column-number-mode} are switched on.
+See the previous two variables for the meaning of the @samp{%l} and
+@samp{%c} format specs.
+@end defvar
+
 @defvar minor-mode-alist
 @anchor{Definition of minor-mode-alist}
 This variable holds an association list whose elements specify how the

etc/NEWS

@@ -1001,10 +1001,10 @@ window after starting).  This variable defaults to nil.
 +++
 *** New user options to control the look of line/column numbers in the mode line.
 'mode-line-position-line-format' is the line number format (when
-'line-number-mode' is on), and 'mode-line-position-column-format' is
-the column number format (when 'column-number-mode' is on).  These are
-also used if both modes are on, which leads to the default in that
-case going from "(5,9)" to "(L5,C9)".
+'line-number-mode' is on), 'mode-line-position-column-format' is
+the column number format (when 'column-number-mode' is on), and
+'mode-line-position-column-line-format' is the combined format (when
+both modes are on).
 
 +++
 *** New command 'submit-emacs-patch'.

lisp/bindings.el

@@ -411,6 +411,8 @@ zero, otherwise they start from one."
   :type 'boolean
   :group 'mode-line
   :version "26.1")
+(make-obsolete-variable 'column-number-indicator-zero-based
+                        'mode-line-position-column-format "28.1")
 
 (defcustom mode-line-percent-position '(-3 "%p")
   "Specification of \"percentage offset\" of window through buffer.
@@ -431,24 +433,41 @@ displayed in `mode-line-position', a component of the default
   :group 'mode-line)
 (put 'mode-line-percent-position 'risky-local-variable t)
 
-(defcustom mode-line-position-line-format "L%l"
+(defcustom mode-line-position-line-format '(-6 " L%l")
   "Format used to display line numbers in the mode line.
 This is used when `line-number-mode' is switched on.  The \"%l\"
 format spec will be replaced by the line number."
-  :type 'string
+  :type 'form
   :version "28.1"
   :group 'mode-line)
 
-(defcustom mode-line-position-column-format "C%c"
+(defcustom mode-line-position-column-format '(-6 " C%c")
   "Format used to display column numbers in the mode line.
 This is used when `column-number-mode' is switched on.  The
 \"%c\" format spec will be replaced by the column number, which
 is zero-based if `column-number-indicator-zero-based' is non-nil,
-and one-based if `column-number-indicator-zero-based' is nil."
-  :type 'string
+and one-based if `column-number-indicator-zero-based' is nil.."
+  :type 'form
   :version "28.1"
   :group 'mode-line)
 
+(defcustom mode-line-position-column-line-format '(-10 " (%l,%c)")
+  "Format used to display combined line/column numbers in the mode line.
+This is used when `column-number-mode' and `line-number-mode' are
+switched on.  The \"%c\" format spec will be replaced by the
+column number, which is zero-based if
+`column-number-indicator-zero-based' is non-nil, and one-based if
+`column-number-indicator-zero-based' is nil."
+  :type 'form
+  :version "28.1"
+  :group 'mode-line)
+
+(defconst mode-line-position--column-line-properties
+  (list 'local-map mode-line-column-line-number-mode-map
+        'mouse-face 'mode-line-highlight
+        'help-echo "Line number and Column number\n\
+mouse-1: Display Line and Column Mode Menu"))
+
 (defvar mode-line-position
   `((:propertize
      mode-line-percent-position
@@ -468,44 +487,27 @@ mouse-1: Display Line and Column Mode Menu")))
     (line-number-mode
      ((column-number-mode
        (column-number-indicator-zero-based
-        (10 ,(propertize
-              (format " (%s,%s)"
-                      mode-line-position-line-format
-                      mode-line-position-column-format)
-              'local-map mode-line-column-line-number-mode-map
-              'mouse-face 'mode-line-highlight
-              'help-echo "Line number and Column number\n\
-mouse-1: Display Line and Column Mode Menu"))
-        (10 ,(propertize
-              (format " (%s,%s)"
-                      mode-line-position-line-format
-                      (replace-in-string "%c" "%C"
-                                         mode-line-position-column-format))
-              'local-map mode-line-column-line-number-mode-map
-              'mouse-face 'mode-line-highlight
-              'help-echo "Line number and Column number\n\
-mouse-1: Display Line and Column Mode Menu")))
-       (6 ,(propertize
-	    (format " %s" mode-line-position-line-format)
-	    'local-map mode-line-column-line-number-mode-map
-	    'mouse-face 'mode-line-highlight
-	    'help-echo "Line Number\n\
-mouse-1: Display Line and Column Mode Menu"))))
-     ((column-number-mode
-       (column-number-indicator-zero-based
-        (5 ,(propertize
-             (format " %s" mode-line-position-column-format)
-             'local-map mode-line-column-line-number-mode-map
-             'mouse-face 'mode-line-highlight
-             'help-echo "Column number\n\
-mouse-1: Display Line and Column Mode Menu"))
-        (5 ,(propertize
-             (format " %s" (replace-in-string "%c" "%C"
-                                              mode-line-position-column-format))
-             'local-map mode-line-column-line-number-mode-map
-             'mouse-face 'mode-line-highlight
-             'help-echo "Column number\n\
-mouse-1: Display Line and Column Mode Menu")))))))
+        (:propertize
+         mode-line-position-column-line-format
+         ,@mode-line-position--column-line-properties)
+        (:propertize
+         (,(car mode-line-position-column-line-format)
+          (:eval (replace-in-string
+                  "%c" "%C" (cadr mode-line-position-column-line-format))))
+         ,@mode-line-position--column-line-properties))
+       (:propertize
+	mode-line-position-line-format
+        ,@mode-line-position--column-line-properties)))
+     (column-number-mode
+      (column-number-indicator-zero-based
+       (:propertize
+        mode-line-position-column-format
+        ,@mode-line-position--column-line-properties)
+       (:propertize
+        (,(car mode-line-position-column-format)
+         (:eval (replace-in-string
+                 "%c" "%C" (cadr mode-line-position-column-format))))
+        ,@mode-line-position--column-line-properties)))))
   "Mode line construct for displaying the position in the buffer.
 Normally displays the buffer percentage and, optionally, the
 buffer size, the line number and the column number.")