[init] Disable GUI elements in early-init as well (#14559)

* [init] Disable GUI elements in early-init as well

Can provide a smoother startup by reducing graphical artifacts.

* [core] Add file for early-init functions

Needed to make the tests to work as early-init.el is not sourced
during tests.

Fixes error:

   Symbol’s function definition is void: spacemacs/removes-gui-elements

core/core-early-funcs.el

@@ -0,0 +1,39 @@
+;;; core-early-funcs.el --- Spacemacs Core File
+;;
+;; This file is sourced by emacs early-init.el file.
+;;
+;; Copyright (c) 2012-2021 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+(defun spacemacs/removes-gui-elements ()
+  "Remove the menu bar, tool bar and scroll bars."
+  ;; removes the GUI elements
+  (when (and (fboundp 'scroll-bar-mode) (not (eq scroll-bar-mode -1)))
+    (scroll-bar-mode -1))
+  (when (and (fboundp 'tool-bar-mode) (not (eq tool-bar-mode -1)))
+    (tool-bar-mode -1))
+  (unless (memq (window-system) '(mac ns))
+    (when (and (fboundp 'menu-bar-mode) (not (eq menu-bar-mode -1)))
+      (menu-bar-mode -1)))
+  ;; tooltips in echo-aera
+  (when (and (fboundp 'tooltip-mode) (not (eq tooltip-mode -1)))
+    (tooltip-mode -1)))
+
+(provide 'core-early-funcs)

core/core-spacemacs.el

@@ -45,6 +45,7 @@
 (require 'core-spacemacs-buffer)
 (require 'core-keybindings)
 (require 'core-toggle)
+(require 'core-early-funcs)
 (require 'core-funcs)
 (require 'core-micro-state)
 (require 'core-transient-state)
@@ -73,7 +74,7 @@ the final step of executing code in `emacs-startup-hook'.")
   (setq ad-redefinition-action 'accept)
   ;; this is for a smoother UX at startup (i.e. less graphical glitches)
   (hidden-mode-line-mode)
-  (spacemacs//removes-gui-elements)
+  (spacemacs/removes-gui-elements)
   (spacemacs//setup-ido-vertical-mode)
   ;; explicitly set the preferred coding systems to avoid annoying prompt
   ;; from emacs (especially on Microsoft Windows)
@@ -174,20 +175,6 @@ the final step of executing code in `emacs-startup-hook'.")
   ;; install the dotfile if required
   (dotspacemacs/maybe-install-dotfile))
 
-(defun spacemacs//removes-gui-elements ()
-  "Remove the menu bar, tool bar and scroll bars."
-  ;; removes the GUI elements
-  (when (and (fboundp 'scroll-bar-mode) (not (eq scroll-bar-mode -1)))
-    (scroll-bar-mode -1))
-  (when (and (fboundp 'tool-bar-mode) (not (eq tool-bar-mode -1)))
-    (tool-bar-mode -1))
-  (unless (spacemacs/window-system-is-mac)
-    (when (and (fboundp 'menu-bar-mode) (not (eq menu-bar-mode -1)))
-      (menu-bar-mode -1)))
-  ;; tooltips in echo-aera
-  (when (and (fboundp 'tooltip-mode) (not (eq tooltip-mode -1)))
-    (tooltip-mode -1)))
-
 (defun spacemacs//setup-ido-vertical-mode ()
   "Setup `ido-vertical-mode'."
   (require 'ido-vertical-mode)

early-init.el

@@ -34,3 +34,10 @@
 ;; the package manager before loading the init file, so this file is neither
 ;; needed nor loaded on those versions.
 (setq package-enable-at-startup nil)
+
+(load (concat (file-name-directory load-file-name)
+              "core/core-early-funcs.el")
+      nil (not init-file-debug))
+
+;; Remove GUI elements early to avoid some possible grapical glitches.
+(spacemacs/removes-gui-elements)