Properly solve incompatibility between e-p-m, e-l-m and cc-mode

* lisp/progmodes/cc-cmds.el (c--disable-fix-of-bug-33794): Remove.
(c--with-post-self-insert-hook-maybe): Remove.
(c-self-insert-command): New function.
(c-electric-pound, c-electric-brace, c-electric-slash)
(c-electric-star, c-electric-lt-gt, c-electric-paren): Use it.

* test/lisp/electric-tests.el (c--disable-fix-of-bug-33794):
Remove.
(electric-layout-int-main-kernel-style)
(electric-layout-int-main-allman-style): Don't set
c--disable-fix-of-bug-33794.

lisp/progmodes/cc-cmds.el

@@ -485,19 +485,13 @@ function to control that."
       (c-hungry-delete-forward)
     (c-hungry-delete-backwards)))
 
-(defvar c--disable-fix-of-bug-33794 nil
-  "If non-nil disable alans controversional fix of 33794.
-This fix breaks most features of `electric-pair-mode' by
-incompletely reimplementing in in this mode.")
-
-(defmacro c--with-post-self-insert-hook-maybe (&rest body)
-  `(let ((post-self-insert-hook
-	  (if c--disable-fix-of-bug-33794
-	      post-self-insert-hook
-	    ;; Acording to AM: Disable random functionality to get
-	    ;; defined functionality from `self-insert-command'
-	    nil)))
-     ,@body))
+(defun c-self-insert-command (arg)
+  ;; If `c-auto-newline' is on we use our own implementation of
+  ;; `electric-pair-mode' and `electric-layout-mode' doesn't make
+  ;; sense.
+  (let ((electric-layout-mode (not c-auto-newline))
+	(electric-pair-mode (not c-auto-newline)))
+     (self-insert-command arg)))
 
 (defun c-electric-pound (arg)
   "Insert a \"#\".
@@ -518,8 +512,7 @@ inside a literal or a macro, nothing special happens."
 			  (eq (char-before) ?\\))))
 	    (c-in-literal)))
       ;; do nothing special
-      (c--with-post-self-insert-hook-maybe
-	(self-insert-command (prefix-numeric-value arg)))
+      (c-self-insert-command (prefix-numeric-value arg))
     ;; place the pound character at the left edge
     (let ((pos (- (point-max) (point)))
 	  (bolp (bolp)))
@@ -871,37 +864,35 @@ settings of `c-cleanup-list' are done."
 
     ;; Insert the brace.  Note that expand-abbrev might reindent
     ;; the line here if there's a preceding "else" or something.
-    (c--with-post-self-insert-hook-maybe
-     (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
 
     ;; Emulate `electric-pair-mode'.
-    (unless c--disable-fix-of-bug-33794
-      (when (and (boundp 'electric-pair-mode)
-		 electric-pair-mode)
-	(let ((size (buffer-size))
-	      (c-in-electric-pair-functionality t)
-	      post-self-insert-hook)
-	  (electric-pair-post-self-insert-function)
-	  (setq got-pair-} (and at-eol
-				(eq (c-last-command-char) ?{)
-				(eq (char-after) ?}))
-		electric-pair-deletion (< (buffer-size) size))))
-
-      ;; Perform any required CC Mode electric actions.
-      (cond
-       ((or literal arg (not c-electric-flag) active-region))
-       ((not at-eol)
-	(c-indent-line))
-       (electric-pair-deletion
-	(c-indent-line)
-	(c-do-brace-electrics 'ignore nil))
-       (t (c-do-brace-electrics nil nil)
-	  (when got-pair-}
-	    (save-excursion
-	      (forward-char)
-	      (c-do-brace-electrics 'assume 'ignore))
-	    (c-indent-line)))))
+    (when (and (boundp 'electric-pair-mode)
+	       electric-pair-mode
+	       c-auto-newline)
+      (let ((size (buffer-size))
+	    (c-in-electric-pair-functionality t)
+	    post-self-insert-hook)
+	(electric-pair-post-self-insert-function)
+	(setq got-pair-} (and at-eol
+			      (eq (c-last-command-char) ?{)
+			      (eq (char-after) ?}))
+	      electric-pair-deletion (< (buffer-size) size))))
 
+    ;; Perform any required CC Mode electric actions.
+    (cond
+     ((or literal arg (not c-electric-flag) active-region))
+     ((not at-eol)
+      (c-indent-line))
+     (electric-pair-deletion
+      (c-indent-line)
+      (c-do-brace-electrics 'ignore nil))
+     (t (c-do-brace-electrics nil nil)
+	(when got-pair-}
+	  (save-excursion
+	    (forward-char)
+	    (c-do-brace-electrics 'assume 'ignore))
+	  (c-indent-line))))
 
 
     ;; blink the paren
@@ -960,8 +951,7 @@ is inhibited."
 		       c-electric-flag
 		       (eq (c-last-command-char) ?/)
 		       (eq (char-before) (if literal ?* ?/))))
-    (c--with-post-self-insert-hook-maybe
-      (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
     (if indentp
 	(indent-according-to-mode))))
 
@@ -974,8 +964,7 @@ supplied, point is inside a literal, or `c-syntactic-indentation' is nil,
 this indentation is inhibited."
 
   (interactive "*P")
-  (c--with-post-self-insert-hook-maybe
-    (self-insert-command (prefix-numeric-value arg)))
+  (c-self-insert-command (prefix-numeric-value arg))
   ;; if we are in a literal, or if arg is given do not reindent the
   ;; current line, unless this star introduces a comment-only line.
   (if (c-save-buffer-state ()
@@ -1022,8 +1011,7 @@ settings of `c-cleanup-list'."
       (setq lim (c-most-enclosing-brace (c-parse-state))
 	    literal (c-in-literal lim)))
 
-    (c--with-post-self-insert-hook-maybe
-      (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
 
     (if (and c-electric-flag (not literal) (not arg))
 	;; do all cleanups and newline insertions if c-auto-newline is on.
@@ -1092,8 +1080,7 @@ reindented unless `c-syntactic-indentation' is nil.
 	 newlines is-scope-op
 	 ;; shut this up
 	 (c-echo-syntactic-information-p nil))
-    (c--with-post-self-insert-hook-maybe
-      (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
     ;; Any electric action?
     (if (and c-electric-flag (not literal) (not arg))
 	;; Unless we're at EOL, only re-indentation happens.
@@ -1186,8 +1173,7 @@ numeric argument is supplied, or the point is inside a literal."
   (let ((c-echo-syntactic-information-p nil)
 	final-pos found-delim case-fold-search)
 
-    (c--with-post-self-insert-hook-maybe
-      (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
     (setq final-pos (point))
 
 ;;;; 2010-01-31: There used to be code here to put a syntax-table text
@@ -1252,8 +1238,7 @@ newline cleanups are done if appropriate; see the variable `c-cleanup-list'."
 	;; shut this up
 	(c-echo-syntactic-information-p nil)
 	case-fold-search)
-    (c--with-post-self-insert-hook-maybe
-      (self-insert-command (prefix-numeric-value arg)))
+    (c-self-insert-command (prefix-numeric-value arg))
 
     (if (and (not arg) (not literal))
 	(let* (	;; We want to inhibit blinking the paren since this will
@@ -1303,11 +1288,11 @@ newline cleanups are done if appropriate; see the variable `c-cleanup-list'."
 	      (insert-and-inherit "} catch (")))
 
 	  ;; Apply `electric-pair-mode' stuff.
-	  (unless c--disable-fix-of-bug-33794
-	    (when (and (boundp 'electric-pair-mode)
-		       electric-pair-mode)
-	      (let (post-self-insert-hook)
-		(electric-pair-post-self-insert-function))))
+	  (when (and c-auto-newline
+		     (boundp 'electric-pair-mode)
+		     electric-pair-mode)
+	    (let (post-self-insert-hook)
+	      (electric-pair-post-self-insert-function)))
 
 	  ;; Check for clean-ups at function calls.  These two DON'T need
 	  ;; `c-electric-flag' or `c-syntactic-indentation' set.

test/lisp/electric-tests.el

@@ -47,14 +47,10 @@
   (declare (indent defun) (debug t))
   `(call-with-saved-electric-modes #'(lambda () ,@body)))
 
-;; Defined in lisp/progmodes/cc-cmds.el
-(defvar c--disable-fix-of-bug-33794 t)
-
 (defun electric-pair-test-for (fixture where char expected-string
                                        expected-point mode bindings fixture-fn)
   (with-temp-buffer
     (funcall mode)
-    (setq-local c--disable-fix-of-bug-33794 t)
     (insert fixture)
     (save-electric-modes
       (let ((last-command-event char)
@@ -825,7 +821,6 @@ baz\"\""
     (electric-layout-local-mode 1)
     (electric-pair-local-mode 1)
     (electric-indent-local-mode 1)
-    (setq-local c--disable-fix-of-bug-33794 t)
     (setq-local electric-layout-rules
                 '((?\{ . (after-stay after))))
     (insert "int main () ")
@@ -839,7 +834,6 @@ baz\"\""
     (electric-layout-local-mode 1)
     (electric-pair-local-mode 1)
     (electric-indent-local-mode 1)
-    (setq-local c--disable-fix-of-bug-33794 t)
     (setq-local electric-layout-rules
                 '((?\{ . (before after-stay after))))
     (insert "int main () ")