Merge from origin/emacs-31

498eafb4f1 ; * lisp/help.el (temp-buffer-resize-mode): Doc fix (bug#...
19a7d4ce7c Fix behavior of 'temp-buffer-resize-mode' (Bug#81207)
927a7fff5e Restore public interfaces for accessing built-in package ...
ea3d78898a Allow uninstalling dependency with multiple installations
4a3d5b110e Fix memcpy size in 'merge_faces'

lisp/emacs-lisp/package-activate.el

@@ -208,8 +208,6 @@ called via `package-activate-all'.  To change which packages are
 loaded and/or activated, customize `package-load-list'.")
 (put 'package-alist 'risky-local-variable t)
 
-;;;; Public interfaces for accessing built-in package info
-
 ;;;###autoload
 (defvar package-activated-list nil
   ;; FIXME: This should implicitly include all builtin packages.

lisp/emacs-lisp/package.el

@@ -534,6 +534,22 @@ package."
   reqs
   summary)
 
+
+;;; Public interfaces for accessing built-in package info
+
+(defun package-versioned-builtin-packages ()
+  "Return a list of all the versioned built-in packages.
+The return value is a list of names of built-in packages represented as
+symbols."
+  (mapcar #'car package--builtin-versions))
+
+(defun package-builtin-package-version (package)
+  "Return the version of a built-in PACKAGE given by its symbol.
+The return value is a list of integers representing the version of
+PACKAGE, in the format returned by `version-to-list', or nil if the
+package is built-in but has no version or is not a built-in package."
+  (alist-get package package--builtin-versions))
+
 
 ;;; Installed packages
 
@@ -2379,6 +2395,15 @@ installed), maybe you need to \\[package-refresh-contents]")
   (equal (cadr (assq (package-desc-name pkg) package-alist))
          pkg))
 
+(defun package--dependency-p (pkg)
+  "Return non-nil if PKG is a dependency."
+  (let ((name (package-desc-name pkg)))
+    (catch 'is-dependency
+      (dolist (ent (package--alist) nil)
+        (dolist (desc (cdr ent))
+          (when (assq name (package-desc-reqs desc))
+            (throw 'is-dependency t)))))))
+
 (declare-function comp-el-to-eln-filename "comp.c")
 (defvar package-vc-repository-store)
 (defun package--delete-directory (dir)
@@ -2439,9 +2464,14 @@ If NOSAVE is non-nil, the package is not removed from
     ;; `package-selected-packages' even if it can't be deleted.
     (when (and (null nosave)
                (package--user-selected-p name)
+               (or
                 ;; Don't deselect if this is an older version of an
                 ;; upgraded package.
-               (package--newest-p pkg-desc))
+                (package--newest-p pkg-desc)
+                ;; Don't deselect if the package is a dependency and
+                ;; there are multiple installations (bug#81082).
+                (and (length< (alist-get name package-alist) 1)
+                     (package--dependency-p pkg-desc))))
       (package--save-selected-packages (remove name package-selected-packages)))
     (cond ((not (string-prefix-p (file-name-as-directory
                                   (expand-file-name package-user-dir))
@@ -2452,7 +2482,16 @@ If NOSAVE is non-nil, the package is not removed from
           ((and (null force)
                 (setq pkg-used-elsewhere-by
                       (let ((package-alist new-package-alist))
-                        (package--used-elsewhere-p pkg-desc)))) ;See bug#65475
+                        (package--used-elsewhere-p pkg-desc))) ;See bug#65475
+                (and-let* ((other (package-get-descriptor
+                                   name 'installed
+                                   (lambda (pkg-other)
+                                     (not (equal pkg-desc pkg-other))))))
+                  (not (yes-or-no-p
+                        (format "Package `%s' is used by `%s' as dependency, but `%s' is also available.  Use that instead?"
+                                (package-desc-full-name pkg-desc)
+                                (package-desc-name pkg-used-elsewhere-by)
+                                (package-desc-full-name other))))))
            ;; Don't delete packages used as dependency elsewhere.
            (error "Package `%s' is used by `%s' as dependency, not deleting"
                   (package-desc-full-name pkg-desc)

lisp/help.el

@@ -1998,18 +1998,20 @@ function is called, the window to be resized is selected."
 (define-minor-mode temp-buffer-resize-mode
   "Toggle auto-resizing temporary buffer windows (Temp Buffer Resize Mode).
 
-When Temp Buffer Resize mode is enabled, the windows in which we
-show a temporary buffer are automatically resized in height to
+When Temp Buffer Resize mode is enabled, the windows in which Emacs
+shows a temporary buffer are automatically resized in height to
 fit the buffer's contents, but never more than
 `temp-buffer-max-height' nor less than `window-min-height'.
 
-A window is resized only if it has been specially created for the
-buffer.  Windows that have shown another buffer before are not
-resized.  A frame is resized only if `fit-frame-to-buffer' is
-non-nil.
+When this mode is enabled, a window is resized only if it has been
+specially created for a temporary buffer.  Windows that have shown
+another buffer before being reused for displaying a temporary buffer
+are not resized (but note that if `even-window-sizes' is non-nil, they
+might beresized in some situations anyway).  A frame is resized only
+if `fit-frame-to-buffer' is non-nil.
 
 This mode is used by `help', `apropos' and `completion' buffers,
-and some others."
+and some others, when they display their pop-up buffers."
   :global t :group 'help
   (if temp-buffer-resize-mode
       ;; `help-make-xrefs' may add a `back' button and thus increase the
@@ -2050,6 +2052,9 @@ provided `fit-frame-to-buffer' is non-nil."
 	 (quit-cadr (cadr (window-parameter window 'quit-restore))))
     ;; Resize WINDOW only if it was made by `display-buffer'.
     (when (or (and (eq quit-cadr 'window)
+                   ;; When WINDOW was reused, its buffer must be the one
+                   ;; initially shown in it (Bug#81207).
+                   (eq buffer (nth 3 (window-parameter window 'quit-restore)))
                    (or (and (window-combined-p window)
 			    (not (eq fit-window-to-buffer-horizontally
 				     'only))

src/xfaces.c

@@ -7272,7 +7272,7 @@ merge_faces (struct window *w, Lisp_Object face_name, int face_id,
 	  Lisp_Object lface_attrs[LFACE_VECTOR_SIZE];
 	  int i;
 
-	  memcpy (lface_attrs, face->lface, LFACE_VECTOR_SIZE);
+	  memcpy (lface_attrs, face->lface, sizeof lface_attrs);
 	  /* Make explicit any attributes whose value is 'reset'.  */
 	  for (i = 1; i < LFACE_VECTOR_SIZE; i++)
 	    if (EQ (lface_attrs[i], Qreset))

test/lisp/emacs-lisp/package-tests.el

@@ -1028,6 +1028,17 @@ but with a different end of line convention (bug#48137)."
             (list new-pkg-desc simple-depend-desc-2 simple-depend-desc-1
                   multi-file-desc simple-depend-desc simple-single-desc)))))
 
+(ert-deftest package-test-builtin-package-info ()
+  "Test public interfaces for querying package info."
+  (should (not (null (package-versioned-builtin-packages))))
+  ;; Picking any built-in library to check the version. Update results
+  ;; as needed.
+  (require 'lisp-mnt)
+  (should (equal (package-builtin-package-version 'cl-lib)
+                 (with-temp-buffer
+                   (insert-file-contents (locate-library "cl-lib.el"))
+                   (version-to-list (lm-version))))))
+
 (provide 'package-test)
 
 ;;; package-tests.el ends here