* lisp/startup.el: Fix bug#45857, bug#30994, and bug#45913.

(command-line): Don't re-evaluate the `custom-delayed-init-variables`
a second time after reading the `early-init.el` file.
(x-apply-session-resources): Set `blink-cursor-mode` rather than
`no-blinking-cursor`.

* lisp/frame.el (blink-cursor-start): Turn `blink-cursor-mode` off
if `blink-cursor-mode` was set to nil.
(blink-cursor-mode): Default to it being enabled regardless of
`window-system`.

* lisp/custom.el (custom-initialize-delay): Fox docstring now that
autoload.el preserves the `:initialize` info.

etc/NEWS

@@ -326,6 +326,10 @@ the buffer cycles the whole buffer between "only top-level headings",
 
 * Changes in Specialized Modes and Packages in Emacs 28.1
 
+** 'blink-cursor-mode' is now enabled by default regardless of the UI.
+It used to be enabled when Emacs is started in GUI mode but not when started
+in text mode.  The cursor still only actually blinks in GUI frames.
+
 ** pcase
 +++
 *** The `pred` pattern can now take the form (pred (not FUN)).

lisp/cus-start.el

@@ -880,7 +880,7 @@ since it could result in memory overflow and make Emacs crash."
       ;; Don't re-add to custom-delayed-init-variables post-startup.
       (unless after-init-time
 	;; Note this is the _only_ initialize property we handle.
-	(if (eq (cadr (memq :initialize rest)) 'custom-initialize-delay)
+	(if (eq (cadr (memq :initialize rest)) #'custom-initialize-delay)
 	    ;; These vars are defined early and should hence be initialized
 	    ;; early, even if this file happens to be loaded late.  so add them
 	    ;; to the end of custom-delayed-init-variables.  Otherwise,

lisp/custom.el

@@ -125,17 +125,7 @@ This is used in files that are preloaded (or for autoloaded
 variables), so that the initialization is done in the run-time
 context rather than the build-time context.  This also has the
 side-effect that the (delayed) initialization is performed with
-the :set function.
-
-For variables in preloaded files, you can simply use this
-function for the :initialize property.  For autoloaded variables,
-you will also need to add an autoload stanza calling this
-function, and another one setting the standard-value property.
-Or you can wrap the defcustom in a progn, to force the autoloader
-to include all of it."		   ; see eg vc-sccs-search-project-dir
-  ;; No longer true:
-  ;; "See `send-mail-function' in sendmail.el for an example."
-
+the :set function."
   ;; Defvar it so as to mark it special, etc (bug#25770).
   (internal--define-uninitialized-variable symbol)
 

lisp/frame.el

@@ -2552,13 +2552,15 @@ Use 0 or negative value to blink forever."
 This starts the timer `blink-cursor-timer', which makes the cursor blink
 if appropriate.  It also arranges to cancel that timer when the next
 command starts, by installing a pre-command hook."
-  (when (null blink-cursor-timer)
+  (cond
+   ((null blink-cursor-mode) (blink-cursor-mode -1))
+   ((null blink-cursor-timer)
     ;; Set up the timer first, so that if this signals an error,
     ;; blink-cursor-end is not added to pre-command-hook.
     (setq blink-cursor-blinks-done 1)
     (blink-cursor--start-timer)
     (add-hook 'pre-command-hook #'blink-cursor-end)
-    (internal-show-cursor nil nil)))
+    (internal-show-cursor nil nil))))
 
 (defun blink-cursor-timer-function ()
   "Timer function of timer `blink-cursor-timer'."
@@ -2615,7 +2617,7 @@ stopped by `blink-cursor-suspend'.  Internally calls
 `blink-cursor--should-blink' and returns its result."
   (let ((should-blink (blink-cursor--should-blink)))
     (when (and should-blink (not blink-cursor-idle-timer))
-      (remove-hook 'post-command-hook 'blink-cursor-check)
+      (remove-hook 'post-command-hook #'blink-cursor-check)
       (blink-cursor--start-idle-timer))
     should-blink))
 
@@ -2637,16 +2639,16 @@ This command is effective only on graphical frames.  On text-only
 terminals, cursor blinking is controlled by the terminal."
   :init-value (not (or noninteractive
 		       no-blinking-cursor
-		       (eq system-type 'ms-dos)
-		       (not (display-blink-cursor-p))))
-  :initialize 'custom-initialize-delay
+		       (eq system-type 'ms-dos)))
+  :initialize #'custom-initialize-delay
   :group 'cursor
   :global t
   (blink-cursor-suspend)
   (remove-hook 'after-delete-frame-functions #'blink-cursor--rescan-frames)
   (remove-function after-focus-change-function #'blink-cursor--rescan-frames)
   (when blink-cursor-mode
-    (add-function :after after-focus-change-function #'blink-cursor--rescan-frames)
+    (add-function :after after-focus-change-function
+                  #'blink-cursor--rescan-frames)
     (add-hook 'after-delete-frame-functions #'blink-cursor--rescan-frames)
     (blink-cursor-check)))
 

lisp/startup.el

@@ -1172,6 +1172,7 @@ please check its value")
         ;; are dependencies between them.
         (nreverse custom-delayed-init-variables))
   (mapc #'custom-reevaluate-setting custom-delayed-init-variables)
+  (setq custom-delayed-init-variables nil)
 
   ;; Warn for invalid user name.
   (when init-file-user
@@ -1301,12 +1302,6 @@ please check its value")
     (startup--setup-quote-display)
     (setq internal--text-quoting-flag t))
 
-  ;; Re-evaluate again the predefined variables whose initial value
-  ;; depends on the runtime context, in case some of them depend on
-  ;; the window-system features.  Example: blink-cursor-mode.
-  (mapc #'custom-reevaluate-setting custom-delayed-init-variables)
-  (setq custom-delayed-init-variables nil)
-
   (normal-erase-is-backspace-setup-frame)
 
   ;; Register default TTY colors for the case the terminal hasn't a
@@ -1487,13 +1482,13 @@ to reading the init file), or afterwards when the user first
 opens a graphical frame.
 
 This can set the values of `menu-bar-mode', `tool-bar-mode',
-`tab-bar-mode', and `no-blinking-cursor', as well as the `cursor' face.
+`tab-bar-mode', and `blink-cursor-mode', as well as the `cursor' face.
 Changed settings will be marked as \"CHANGED outside of Customize\"."
   (let ((no-vals  '("no" "off" "false" "0"))
 	(settings '(("menuBar" "MenuBar" menu-bar-mode nil)
 		    ("toolBar" "ToolBar" tool-bar-mode nil)
 		    ("scrollBar" "ScrollBar" scroll-bar-mode nil)
-		    ("cursorBlink" "CursorBlink" no-blinking-cursor t))))
+		    ("cursorBlink" "CursorBlink" blink-cursor-mode nil))))
     (dolist (x settings)
       (if (member (x-get-resource (nth 0 x) (nth 1 x)) no-vals)
 	  (set (nth 2 x) (nth 3 x)))))