* lisp/apropos.el (apropos-print): Now that `apropos-mode' inherits

from `special-mode', entering it makes the buffer read-only, so
call it only when everything has been already inserted.
* lisp/emacs-lisp/ert.el (ert--setup-results-buffer)
(ert-results-pop-to-backtrace-for-test-at-point)
(ert-results-pop-to-messages-for-test-at-point)
(ert-results-pop-to-timings): Ditto.
* lisp/emacs-lisp/package.el (package--list-packages): Ditto.
* lisp/play/solitaire.el (solitaire): Ditto.

lisp/emacs-lisp/ert.el

@@ -1874,11 +1874,9 @@ BUFFER-NAME, if non-nil, is the buffer name to use."
   (unless buffer-name (setq buffer-name "*ert*"))
   (let ((buffer (get-buffer-create buffer-name)))
     (with-current-buffer buffer
-      (setq buffer-read-only t)
       (let ((inhibit-read-only t))
         (buffer-disable-undo)
         (erase-buffer)
-        (ert-results-mode)
         ;; Erase buffer again in case switching out of the previous
         ;; mode inserted anything.  (This happens e.g. when switching
         ;; from ert-results-mode to ert-results-mode when
@@ -1897,8 +1895,9 @@ BUFFER-NAME, if non-nil, is the buffer name to use."
                 (ewoc-enter-last ewoc
                                  (make-ert--ewoc-entry :test test :hidden-p t)))
           (ert--results-update-ewoc-hf ert--results-ewoc ert--results-stats)
-          (goto-char (1- (point-max)))
-          buffer)))))
+          (goto-char (1- (point-max)))))
+      (ert-results-mode)
+      buffer)))
 
 
 (defvar ert--selector-history nil
@@ -2341,11 +2340,9 @@ To be used in the ERT results buffer."
        (let ((backtrace (ert-test-result-with-condition-backtrace result))
              (buffer (get-buffer-create "*ERT Backtrace*")))
          (pop-to-buffer buffer)
-         (setq buffer-read-only t)
          (let ((inhibit-read-only t))
            (buffer-disable-undo)
            (erase-buffer)
-           (ert-simple-view-mode)
            ;; Use unibyte because `debugger-setup-buffer' also does so.
            (set-buffer-multibyte nil)
            (setq truncate-lines t)
@@ -2354,7 +2351,8 @@ To be used in the ERT results buffer."
            (goto-char (point-min))
            (insert "Backtrace for test `")
            (ert-insert-test-name-button (ert-test-name test))
-           (insert "':\n")))))))
+           (insert "':\n")
+           (ert-simple-view-mode)))))))
 
 (defun ert-results-pop-to-messages-for-test-at-point ()
   "Display the part of the *Messages* buffer generated during the test at point.
@@ -2367,16 +2365,15 @@ To be used in the ERT results buffer."
          (result (aref (ert--stats-test-results stats) pos)))
     (let ((buffer (get-buffer-create "*ERT Messages*")))
       (pop-to-buffer buffer)
-      (setq buffer-read-only t)
       (let ((inhibit-read-only t))
         (buffer-disable-undo)
         (erase-buffer)
-        (ert-simple-view-mode)
         (insert (ert-test-result-messages result))
         (goto-char (point-min))
         (insert "Messages for test `")
         (ert-insert-test-name-button (ert-test-name test))
-        (insert "':\n")))))
+        (insert "':\n")
+        (ert-simple-view-mode)))))
 
 (defun ert-results-pop-to-should-forms-for-test-at-point ()
   "Display the list of `should' forms executed during the test at point.
@@ -2389,11 +2386,9 @@ To be used in the ERT results buffer."
          (result (aref (ert--stats-test-results stats) pos)))
     (let ((buffer (get-buffer-create "*ERT list of should forms*")))
       (pop-to-buffer buffer)
-      (setq buffer-read-only t)
       (let ((inhibit-read-only t))
         (buffer-disable-undo)
         (erase-buffer)
-        (ert-simple-view-mode)
         (if (null (ert-test-result-should-forms result))
             (insert "\n(No should forms during this test.)\n")
           (loop for form-description in (ert-test-result-should-forms result)
@@ -2411,7 +2406,8 @@ To be used in the ERT results buffer."
         (insert (concat "(Values are shallow copies and may have "
                         "looked different during the test if they\n"
                         "have been modified destructively.)\n"))
-        (forward-line 1)))))
+        (forward-line 1)
+        (ert-simple-view-mode)))))
 
 (defun ert-results-toggle-printer-limits-for-test-at-point ()
   "Toggle how much of the condition to print for the test at point.
@@ -2443,11 +2439,9 @@ To be used in the ERT results buffer."
     (setq data (sort data (lambda (a b)
                             (> (second a) (second b)))))
     (pop-to-buffer buffer)
-    (setq buffer-read-only t)
     (let ((inhibit-read-only t))
       (buffer-disable-undo)
       (erase-buffer)
-      (ert-simple-view-mode)
       (if (null data)
           (insert "(No data)\n")
         (insert (format "%-3s  %8s %8s\n" "" "time" "cumul"))
@@ -2460,7 +2454,8 @@ To be used in the ERT results buffer."
                 (insert "\n"))))
       (goto-char (point-min))
       (insert "Tests by run time (seconds):\n\n")
-      (forward-line 1))))
+      (forward-line 1)
+      (ert-simple-view-mode))))
 
 ;;;###autoload
 (defun ert-describe-test (test-or-test-name)

lisp/emacs-lisp/package.el

@@ -1658,10 +1658,10 @@ list; the default is to display everything in `package-alist'."
   (require 'finder-inf nil t)
   (let ((buf (get-buffer-create "*Packages*")))
     (with-current-buffer buf
-      (package-menu-mode)
       (set (make-local-variable 'package-menu-package-list) packages)
       (set (make-local-variable 'package-menu-sort-key) nil)
-      (package--generate-package-list))
+      (package--generate-package-list)
+      (package-menu-mode))
     ;; The package menu buffer has keybindings.  If the user types
     ;; `M-x list-packages', that suggests it should become current.
     (switch-to-buffer buf)))