Revert "Fix pretty-printing of multiple JSON objects"

This reverts commit 48daf77a9d.

This apparently led to build errors.

lisp/json.el

@@ -758,8 +758,10 @@ With prefix argument MINIMIZE, minimize it instead."
   (json-pretty-print (point-min) (point-max) minimize))
 
 (defvar json-pretty-print-max-secs 2.0
-  "Maximum time for `json-pretty-print's comparison.")
-(make-obsolete-variable json-pretty-print-max-secs nil "27.1")
+  "Maximum time for `json-pretty-print's comparison.
+The function `json-pretty-print' uses `replace-region-contents'
+(which see) passing the value of this variable as argument
+MAX-SECS.")
 
 (defun json-pretty-print (begin end &optional minimize)
   "Pretty-print selected region.
@@ -769,17 +771,14 @@ With prefix argument MINIMIZE, minimize it instead."
         ;; Distinguish an empty objects from 'null'
         (json-null :json-null)
         ;; Ensure that ordering is maintained
-        (json-object-type 'alist)
-        json)
-    (save-restriction
-      (narrow-to-region begin end)
-      (goto-char begin)
-      (while (setq json (condition-case _
-                            (json-read)
-                          (json-error nil)))
-        (delete-region begin (point))
-        (insert (json-encode json))
-        (setq begin (point))))))
+        (json-object-type 'alist))
+    (replace-region-contents
+     begin end
+     (lambda () (json-encode (json-read)))
+     json-pretty-print-max-secs
+     ;; FIXME: What's a good value here?  Can we use something better,
+     ;; e.g., by deriving a value from the size of the region?
+     64)))
 
 (defun json-pretty-print-buffer-ordered (&optional minimize)
   "Pretty-print current buffer with object keys ordered.