Subject: 26.0.50; Unused faces drop from hi-lock--unused-faces

From: Tino Calancha <[email-masked]>
Date: Wed, 26 Apr 2017 19:13:37 +0900

emacs -Q
M-s hr t RET RET
M-s hr t RET RET ; Already highlighted
M-s hr f RET RET ; Should offer hi-pink face, but it offers hi-green.

--8<-----------------------------cut here---------------start------------->8---
>From 287bff616ef715c54628fba5c6db95b878f1519f Mon Sep 17 00:00:00 2001
From: Tino Calancha <[email-masked]>
Date: Wed, 26 Apr 2017 19:06:47 +0900
Subject: [PATCH] Drop face from hi-lock--unused-faces only when used

* lisp/hi-lock.el (hi-lock-set-pattern): If REGEXP is
already highlighted, then push FACE into hi-lock--unused-faces.
* test/lisp/hi-lock-tests.el (hi-lock-bug26666): Add test.
---
 lisp/hi-lock.el            |  3 ++-
 test/lisp/hi-lock-tests.el | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 test/lisp/hi-lock-tests.el

diff --git a/lisp/hi-lock.el b/lisp/hi-lock.el
index ebd18621ef..5139e01fa8 100644
--- a/lisp/hi-lock.el
+++ b/lisp/hi-lock.el
@@ -695,7 +695,8 @@ hi-lock-set-pattern
   (setq regexp (hi-lock--hashcons regexp))
   (let ((pattern (list regexp (list 0 (list 'quote face) 'prepend))))
     ;; Refuse to highlight a text that is already highlighted.
-    (unless (assoc regexp hi-lock-interactive-patterns)
+    (if (assoc regexp hi-lock-interactive-patterns)
+        (add-to-list 'hi-lock--unused-faces (face-name face))
       (push pattern hi-lock-interactive-patterns)
       (if (and font-lock-mode (font-lock-specified-p major-mode))
 	  (progn
diff --git a/test/lisp/hi-lock-tests.el b/test/lisp/hi-lock-tests.el
new file mode 100644
index 0000000000..2cb662cfac
--- /dev/null
+++ b/test/lisp/hi-lock-tests.el
@@ -0,0 +1,40 @@
+;;; hi-lock-tests.el --- Tests for hi-lock.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017 Free Software Foundation, Inc.
+
+;; Author: Tino Calancha <[email-masked]>
+;; Keywords:
+
+;; 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/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'hi-lock)
+
+(ert-deftest hi-lock-bug26666 ()
+  "Test for http://debbugs.gnu.org/26666 ."
+  (let ((faces hi-lock-face-defaults))
+    (with-temp-buffer
+      (insert "a A b B\n")
+      (cl-letf (((symbol-function 'completing-read)
+                   (lambda (prompt coll x y z hist defaults)
+                     (car defaults))))
+        (dotimes (_ 2)
+          (let ((face (hi-lock-read-face-name)))
+            (hi-lock-set-pattern "a" face))))
+      (should (equal hi-lock--unused-faces (cdr faces))))))
+
+(provide 'hi-lock-tests)
+;;; hi-lock-tests.el ends here
-- 
2.11.0

--8<-----------------------------cut here---------------end--------------->8---
In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-04-26
Repository revision: 513d000c75b582edf9acef1c6df00ee2c382dcb9