From 715927aa2f1baae32040e52d2cfca4aef2edc14b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Le=20Gouguec?= <kevin.legouguec@gmail.com>
Date: Fri, 7 Aug 2020 11:04:53 +0200
Subject: [PATCH] Fix org-fontify-whole-*-line by setting face extension
 (bug#42184)
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* lisp/org-faces.el (org-block): Set background extension beyond
end-of-line.
* lisp/org-compat.el (org--extended-face): New function to add :extend
attribute to face definition for Emacs≥27.
(org--set-faces-extend): New function to temporarily (re)set :extend
for Emacs≥27.
* lisp/org.el (org-mode): Call it to set the extend attribute of
relevant faces to the correct value.
---
 lisp/org-compat.el | 15 +++++++++++++++
 lisp/org-faces.el  |  2 +-
 lisp/org.el        |  6 +++++-
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index 5953f89d2..a9cf400a7 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -109,6 +109,21 @@ is nil)."
       (newline-and-indent))
   (defalias 'org-newline-and-indent #'newline-and-indent))
 
+(defmacro org--extended-face (attributes)
+  "Make face that extends beyond end of line.
+
+Up to Emacs 26, all faces extended beyond end of line; getting
+the same behaviour starting with Emacs 27 requires :extend t."
+  `(nconc ,attributes (when (>= emacs-major-version 27) '(:extend t))))
+
+(defun org--set-faces-extend (faces extend-p)
+  "Set the :extend attribute of FACES to EXTEND-P.
+
+This is a no-op for Emacs versions lower than 27, since face
+extension beyond end of line was not controllable."
+  (when (fboundp 'set-face-extend)
+    (mapc (lambda (f) (set-face-extend f extend-p)) faces)))
+
 
 ;;; Emacs < 26.1 compatibility
 
diff --git a/lisp/org-faces.el b/lisp/org-faces.el
index d78b606ec..0c7de38ff 100644
--- a/lisp/org-faces.el
+++ b/lisp/org-faces.el
@@ -408,7 +408,7 @@ follows a #+DATE:, #+AUTHOR: or #+EMAIL: keyword."
   "Face for #+TITLE:, #+AUTHOR:, #+EMAIL: and #+DATE: keywords."
   :group 'org-faces)
 
-(defface org-block '((t :inherit shadow))
+(defface org-block `((t ,(org--extended-face '(:inherit shadow))))
   "Face text in #+begin ... #+end blocks.
 For source-blocks `org-src-block-faces' takes precedence."
   :group 'org-faces
diff --git a/lisp/org.el b/lisp/org.el
index ee8be256d..d66977dd4 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -4904,7 +4904,11 @@ The following commands are available:
   ;; Try to set `org-hide' face correctly.
   (let ((foreground (org-find-invisible-foreground)))
     (when foreground
-      (set-face-foreground 'org-hide foreground))))
+      (set-face-foreground 'org-hide foreground)))
+  ;; Set face extension as requested.
+  (org--set-faces-extend '(org-block-begin-line org-block-end-line)
+                         org-fontify-whole-block-delimiter-line)
+  (org--set-faces-extend org-level-faces org-fontify-whole-heading-line))
 
 ;; Update `customize-package-emacs-version-alist'
 (add-to-list 'customize-package-emacs-version-alist
-- 
2.28.0