Fix buffer local org-agenda-overriding-columns-format bug

* doc/org-manual.org (Using Column View in the Agenda): Updated
  reference to variable.
* lisp/org-agenda.el (org-agenda-finalize): Set buffer local variable
  instead.
* lisp/org-colview.el (org-overriding-columns-format): Renamed.
(org-agenda-overriding-columns-format): Renamed.
(org-local-columns-format): New buffer local variable.
(org-columns-edit-value): Updated reference to variable.
(org-columns-next-allowed-value): Updated reference to variable.
(org-agenda-columns): Updated reference to variable.

Setting org-agenda-overriding-columns-format as a buffer local value
interferes with how it is used as a dynamically scoped var, so use a
separate variable for buffer local setting.

doc/org-manual.org

@@ -10477,11 +10477,11 @@ environment.  This causes the following issues:
    the entries in the agenda are collected from different files, and
    different files may have different columns formats, this is
    a non-trivial problem.  Org first checks if the variable
- ~org-agenda-overriding-columns-format~ is currently set, and if so,
-   takes the format from there.  Otherwise it takes the format
-   associated with the first item in the agenda, or, if that item does
-   not have a specific format (defined in a property, or in its file),
-   it uses ~org-columns-default-format~.
+ ~org-overriding-columns-format~ is currently set, and if so, takes
+   the format from there.  Otherwise it takes the format associated
+   with the first item in the agenda, or, if that item does not have
+   a specific format (defined in a property, or in its file), it uses
+ ~org-columns-default-format~.
 
 2.
    #+cindex: @samp{CLOCKSUM}, special property

lisp/org-agenda.el

@@ -3766,7 +3766,8 @@ FILTER-ALIST is an alist of filters we need to apply when
 	     (setq-local org-agenda-name name)))
       (setq buffer-read-only nil))))
 
-(defvar org-agenda-overriding-columns-format)  ; From org-colview.el
+(defvar org-overriding-columns-format)
+(defvar org-local-columns-format)
 (defun org-agenda-finalize ()
   "Finishing touch for the agenda buffer, called just before displaying it."
   (unless org-agenda-multi
@@ -3781,9 +3782,9 @@ FILTER-ALIST is an alist of filters we need to apply when
 	  (org-agenda-align-tags))
 	(unless org-agenda-with-colors
 	  (remove-text-properties (point-min) (point-max) '(face nil)))
-	(when (bound-and-true-p org-agenda-overriding-columns-format)
-	  (setq-local org-agenda-overriding-columns-format
-		      org-agenda-overriding-columns-format))
+	(when (bound-and-true-p org-overriding-columns-format)
+	  (setq-local org-local-columns-format
+		      org-overriding-columns-format))
 	(when org-agenda-view-columns-initially
 	  (org-agenda-columns))
 	(when org-agenda-fontify-priorities

lisp/org-colview.el

@@ -565,9 +565,18 @@ for the duration of the command.")
       (org-columns-next-allowed-value)
     (org-columns-edit-value "TAGS")))
 
-(defvar org-agenda-overriding-columns-format nil
+(define-obsolete-variable-alias 'org-agenda-overriding-columns-format
+  'org-overriding-columns-format "Org 9.2.2")
+
+(defvar org-overriding-columns-format nil
   "When set, overrides any other format definition for the agenda.
-Don't set this, this is meant for dynamic scoping.")
+Don't set this, this is meant for dynamic scoping.  Set
+`org-local-columns-format' instead.")
+
+(defvar-local org-local-columns-format nil
+  "When set, overrides any other format definition for the agenda.
+This can be set as a buffer local value to avoid interfering with
+dynamic scoping for `org-overriding-columns-format'.")
 
 (defun org-columns-edit-value (&optional key)
   "Edit the value of the property at point in column view.
@@ -628,7 +637,7 @@ Where possible, use the standard interface for changing this line."
       (org-columns--call action)
       ;; The following let preserves the current format, and makes
       ;; sure that in only a single file things need to be updated.
-      (let* ((org-agenda-overriding-columns-format org-columns-current-fmt)
+      (let* ((org-overriding-columns-format org-columns-current-fmt)
 	     (buffer (marker-buffer pom))
 	     (org-agenda-contributing-files
 	      (list (with-current-buffer buffer
@@ -722,7 +731,7 @@ an integer, select that value."
 	(org-columns--call action)
 	;; The following let preserves the current format, and makes
 	;; sure that in only a single file things need to be updated.
-	(let* ((org-agenda-overriding-columns-format org-columns-current-fmt)
+	(let* ((org-overriding-columns-format org-columns-current-fmt)
 	       (buffer (marker-buffer pom))
 	       (org-agenda-contributing-files
 		(list (with-current-buffer buffer
@@ -1563,7 +1572,8 @@ PARAMS is a property list of parameters:
   (let* ((org-columns--time (float-time))
 	 (fmt
 	  (cond
-	   ((bound-and-true-p org-agenda-overriding-columns-format))
+	   ((bound-and-true-p org-overriding-columns-format))
+	   ((bound-and-true-p org-local-columns-format))
 	   ((let ((m (org-get-at-bol 'org-hd-marker)))
 	      (and m
 		   (or (org-entry-get m "COLUMNS" t)