diff --git a/doc/emacs/custom.texi b/doc/emacs/custom.texi
index 87290734cc9..d8abf81c75f 100644
--- a/doc/emacs/custom.texi
+++ b/doc/emacs/custom.texi
@@ -1328,6 +1328,15 @@ pairs in the file, by typing @kbd{i} at the confirmation prompt --
 these pairs will thereafter be ignored in this file and in all other
 files.
 
+  When Emacs asks for confirmation for setting directory-local
+variables (@pxref{Directory Variables}), typing @kbd{+} at the
+confirmation prompt will set all the variables, and also add the
+directory to the list in @code{safe-local-variable-directories}
+(described below), which will cause Emacs to consider this directory
+as safe for loading any directory-local variables in the future.  The
+@kbd{+} response should only be used for directories whose contents
+you trust.
+
 @vindex safe-local-variable-values
 @vindex ignored-local-variable-values
 @cindex risky variable
@@ -1344,6 +1353,17 @@ record safe values for risky variables, do it directly by customizing
 Similarly, if you want to record values of risky variables that should
 be permanently ignored, customize @code{ignored-local-variable-values}.
 
+@vindex safe-local-variable-directories
+  Sometimes it is helpful to always trust directory-variables in
+certain directories, and skip the confirmation prompt when local
+variables are loaded from those directories, even if the variables are
+risky.  The variable @code{safe-local-variable-directories} holds the
+list of such directories.  The names of the directories in this list
+must be full absolute file names, and should end in a slash.  If the
+variable @code{enable-remote-dir-locals} has a non-@code{nil} value,
+the list can include remote directories as well (@pxref{Remote
+Files}).
+
 @vindex enable-local-variables
   The variable @code{enable-local-variables} allows you to change the
 way Emacs processes local variables.  Its default value is @code{t},
diff --git a/doc/lispref/variables.texi b/doc/lispref/variables.texi
index eadb5c36de6..b3a8cd8110c 100644
--- a/doc/lispref/variables.texi
+++ b/doc/lispref/variables.texi
@@ -1977,6 +1977,18 @@ this can be controlled by using this variable, which is a list of
 symbols.
 @end defvar
 
+@defvar safe-local-variable-directories
+This is a list of directories where local variables are always
+enabled.  Directory-local variables loaded from these directories,
+such as the variables in @file{.dir-locals.el}, will be enabled even
+if they are risky.  The directories in this list must be
+fully-expanded absolute file names that end in a directory separator
+character.  They may also be remote directories if the variable
+@code{enable-remote-dir-locals} is set non-@code{nil}.  Directories in
+this list are matched case-sensitively, even if the filesystem is
+case-sensitive.
+@end defvar
+
 @defun hack-local-variables &optional handle-mode
 This function parses, and binds or evaluates as appropriate, any local
 variables specified by the contents of the current buffer.  The variable
diff --git a/etc/NEWS b/etc/NEWS
index 673db8c8f4f..1dc4f7898e7 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -417,6 +417,10 @@ The new functions 'touch-screen-track-tap' and
 'touch-screen-track-drag' handle tracking common touch screen gestures
 from within a command.
 
+** New variable 'safe-local-variable-directories'.
+This variable names directories in which Emacs will treat all
+directory-local variables as safe.
+
 ** New variable 'inhibit-auto-fill' to temporarily prevent auto-fill.
 
 ** Functions and variables to transpose sexps
diff --git a/lisp/dynamic-setting.el b/lisp/dynamic-setting.el
index 9ce09657345..ebe25ab9c75 100644
--- a/lisp/dynamic-setting.el
+++ b/lisp/dynamic-setting.el
@@ -33,6 +33,7 @@
 ;;; Customizable variables
 
 (declare-function font-get-system-font "xsettings.c" ())
+(declare-function reconsider-frame-font "frame.c" ())
 
 (defvar font-use-system-font)
 
diff --git a/lisp/files.el b/lisp/files.el
index ada37d2e9e5..9fdae107068 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -681,7 +681,8 @@ The command \\[normal-mode], when used interactively,
 always obeys file local variable specifications and the -*- line,
 and ignores this variable.
 
-Also see the `permanently-enabled-local-variables' variable."
+Also see the `permanently-enabled-local-variables' and
+`safe-local-variable-directories' variables."
   :risky t
   :type '(choice (const :tag "Query Unsafe" t)
 		 (const :tag "Safe Only" :safe)
@@ -3696,6 +3697,18 @@ variable to set.")
   "A list of file-local variables that are always enabled.
 This overrides any `enable-local-variables' setting.")
 
+(defcustom safe-local-variable-directories '()
+  "A list of directories where local variables are always enabled.
+Directory-local variables loaded from these directories, such as the
+variables in .dir-locals.el, will be enabled even if they are risky.
+The names of the directories in the list must be absolute, and must
+end in a slash.  Remote directories can be included if the
+variable `enable-remote-dir-locals' is non-nil."
+  :version "30.1"
+  :type '(repeat string)
+  :risky t
+  :group 'find-file)
+
 (defun hack-local-variables-confirm (all-vars unsafe-vars risky-vars dir-name)
   "Get confirmation before setting up local variable values.
 ALL-VARS is the list of all variables to be set up.
@@ -3734,7 +3747,11 @@ n  -- to ignore the local variables list.")
 !  -- to apply the local variables list, and permanently mark these
       values (*) as safe (in the future, they will be set automatically.)
 i  -- to ignore the local variables list, and permanently mark these
-      values (*) as ignored\n\n")
+      values (*) as ignored"
+                    (if dir-name "
++  -- to apply the local variables list, and trust all directory-local
+      variables in this directory\n\n"
+                      "\n\n"))
 	  (insert "\n\n"))
 	(dolist (elt all-vars)
 	  (cond ((member elt unsafe-vars)
@@ -3758,7 +3775,11 @@ i  -- to ignore the local variables list, and permanently mark these
 	(pop-to-buffer buf '(display-buffer--maybe-at-bottom))
 	(let* ((exit-chars '(?y ?n ?\s))
 	       (prompt (format "Please type %s%s: "
-			       (if offer-save "y, n, ! or i" "y or n")
+			       (if offer-save
+                                   (if dir-name
+                                       "y, n, !, i, +"
+                                     "y, n, !, i")
+                                 "y or n")
 			       (if (< (line-number-at-pos (point-max))
 				      (window-body-height))
 				   ""
@@ -3766,8 +3787,13 @@ i  -- to ignore the local variables list, and permanently mark these
 	       char)
 	  (when offer-save
             (push ?i exit-chars)
-            (push ?! exit-chars))
+            (push ?! exit-chars)
+            (when dir-name
+              (push ?+ exit-chars)))
 	  (setq char (read-char-choice prompt exit-chars))
+          (when (and offer-save dir-name (= char ?+))
+            (customize-push-and-save 'safe-local-variable-directories
+                                     (list dir-name)))
 	  (when (and offer-save
                      (or (= char ?!) (= char ?i))
                      unsafe-vars)
@@ -3776,7 +3802,7 @@ i  -- to ignore the local variables list, and permanently mark these
                  'safe-local-variable-values
                'ignored-local-variable-values)
              unsafe-vars))
-	  (prog1 (memq char '(?! ?\s ?y))
+	  (prog1 (memq char '(?! ?\s ?y ?+))
 	    (quit-window t)))))))
 
 (defconst hack-local-variable-regexp
@@ -3908,6 +3934,7 @@ DIR-NAME is the name of the associated directory.  Otherwise it is nil."
 		  (null unsafe-vars)
 		  (null risky-vars))
 	     (memq enable-local-variables '(:all :safe))
+             (member dir-name safe-local-variable-directories)
 	     (hack-local-variables-confirm all-vars unsafe-vars
 					   risky-vars dir-name))
 	 (dolist (elt all-vars)
diff --git a/lisp/net/soap-client.el b/lisp/net/soap-client.el
index e4b8bbd9cb5..866b33decc6 100644
--- a/lisp/net/soap-client.el
+++ b/lisp/net/soap-client.el
@@ -5,7 +5,7 @@
 ;; Author: Alexandru Harsanyi <AlexHarsanyi@gmail.com>
 ;; Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
 ;; Created: December, 2009
-;; Version: 3.2.1
+;; Version: 3.2.2
 ;; Keywords: soap, web-services, comm, hypermedia
 ;; Package: soap-client
 ;; URL: https://github.com/alex-hhh/emacs-soap-client
@@ -717,9 +717,12 @@ representing leap seconds."
                 second)
               minute hour day month year second-fraction datatype time-zone)
       (let ((time
-	     (encode-time (list
-			   (if new-decode-time new-decode-time-second second)
-			   minute hour day month year nil nil time-zone))))
+             ;; Continue calling encode-time the old way, for backward
+             ;; compatibility in GNU ELPA.
+             (apply
+              #'encode-time (list
+                             (if new-decode-time new-decode-time-second second)
+                             minute hour day month year nil nil time-zone))))
         (if new-decode-time
             (with-no-warnings (decode-time time nil t))
           (decode-time time))))))
@@ -946,7 +949,7 @@ This is a specialization of `soap-encode-attributes' for
    (t nil)))
 
 (defun soap-type-is-array? (type)
-  "Return t if TYPE defines an ARRAY."
+  "Return t if TYPE is an ARRAY."
   (and (soap-xs-complex-type-p type)
        (eq (soap-xs-complex-type-indicator type) 'array)))
 
diff --git a/lisp/progmodes/prog-mode.el b/lisp/progmodes/prog-mode.el
index 7a53399ad14..16497097061 100644
--- a/lisp/progmodes/prog-mode.el
+++ b/lisp/progmodes/prog-mode.el
@@ -36,6 +36,7 @@
 (declare-function treesit-available-p "treesit.c")
 (declare-function treesit-parser-list "treesit.c")
 (declare-function treesit-node-type "treesit.c")
+(declare-function treesit-node-at "treesit.c")
 
 (defgroup prog-mode nil
   "Generic programming mode, from which others derive."
diff --git a/lisp/term/haiku-win.el b/lisp/term/haiku-win.el
index ae5a2f2fc6b..50c9cb5b9d4 100644
--- a/lisp/term/haiku-win.el
+++ b/lisp/term/haiku-win.el
@@ -36,6 +36,9 @@
 (require 'menu-bar)
 (require 'fontset)
 (require 'dnd)
+;; For when building a --without-x configuration, where this is not
+;; preloaded.
+(eval-when-compile (require 'mwheel))
 
 (add-to-list 'display-format-alist '(".*" . haiku))
 
diff --git a/lisp/x-dnd.el b/lisp/x-dnd.el
index acfbbed9677..b87fc97f8fd 100644
--- a/lisp/x-dnd.el
+++ b/lisp/x-dnd.el
@@ -31,6 +31,9 @@
 ;;; Code:
 
 (require 'dnd)
+;; For when building a --without-x configuration, where this is not
+;; preloaded.
+(eval-when-compile (require 'mwheel))
 
 ;;; Customizable variables
 (defcustom x-dnd-test-function #'x-dnd-default-test-function
diff --git a/src/lread.c b/src/lread.c
index fe48e614393..1d49e7ae6cd 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -2883,12 +2883,6 @@ character_name_to_code (char const *name, ptrdiff_t name_len,
    Unicode 9.0.0 the maximum is 83, so this should be safe.  */
 enum { UNICODE_CHARACTER_NAME_LENGTH_BOUND = 200 };
 
-static AVOID
-invalid_escape_syntax_error (void)
-{
-  error ("Invalid escape character syntax");
-}
-
 /* Read a character escape sequence, assuming we just read a backslash
    and one more character (next_char).  */
 static int
@@ -2920,7 +2914,7 @@ read_char_escape (Lisp_Object readcharfun, int next_char)
 
     case '\n':
       /* ?\LF is an error; it's probably a user mistake.  */
-      error ("Invalid escape character syntax");
+      error ("Invalid escape char syntax: \\<newline>");
 
     /* \M-x etc: set modifier bit and parse the char to which it applies,
        allowing for chains such as \M-\S-\A-\H-\s-\C-q.  */
@@ -2944,7 +2938,7 @@ read_char_escape (Lisp_Object readcharfun, int next_char)
 	      }
 	    else
 	      /* \M, \S, \H, \A not followed by a hyphen is an error.  */
-	      invalid_escape_syntax_error ();
+	      error ("Invalid escape char syntax: \\%c not followed by -", c);
 	  }
 	modifiers |= mod;
 	c1 = READCHAR;
@@ -2964,7 +2958,7 @@ read_char_escape (Lisp_Object readcharfun, int next_char)
       {
 	int c1 = READCHAR;
 	if (c1 != '-')
-	  invalid_escape_syntax_error ();
+	  error ("Invalid escape char syntax: \\%c not followed by -", c);
       }
       FALLTHROUGH;
     /* The prefixes \C- and \^ are equivalent.  */
@@ -3029,7 +3023,7 @@ read_char_escape (Lisp_Object readcharfun, int next_char)
 	  }
 
 	if (count == 0)
-	  invalid_escape_syntax_error ();
+	  error ("Invalid escape char syntax: \\x not followed by hex digit");
 	if (count < 3 && i >= 0x80)
 	  i = BYTE8_TO_CHAR (i);
 	modifiers |= i & CHAR_MODIFIER_MASK;
diff --git a/test/lisp/files-tests.el b/test/lisp/files-tests.el
index aadb60e1de7..e87bb3cfa0a 100644
--- a/test/lisp/files-tests.el
+++ b/test/lisp/files-tests.el
@@ -166,6 +166,27 @@ form.")
       (hack-local-variables)
       (should (eq lexical-binding nil)))))
 
+(ert-deftest files-tests-safe-local-variable-directories ()
+  ;; safe-local-variable-directories should be risky,
+  ;; so use it as an arbitrary risky variable.
+  (let ((test-alist '((safe-local-variable-directories . "some_val")))
+        (fakedir "/test1/test2/")
+        (enable-local-eval t))
+    (with-temp-buffer
+      (setq safe-local-variable-directories (list fakedir))
+      (hack-local-variables-filter test-alist fakedir)
+      (should (equal file-local-variables-alist test-alist)))
+    (with-temp-buffer
+      (setq safe-local-variable-directories (list fakedir))
+      (setq noninteractive t)
+      (hack-local-variables-filter test-alist "wrong")
+      (should-not (equal file-local-variables-alist test-alist)))
+    (with-temp-buffer
+      (setq safe-local-variable-directories '())
+      (setq noninteractive t)
+      (hack-local-variables-filter test-alist fakedir)
+      (should-not (equal file-local-variables-alist test-alist)))))
+
 (defvar files-test-bug-18141-file
   (ert-resource-file "files-bug18141.el.gz")
   "Test file for bug#18141.")