Summary: The face org-block-end-line is propagating to the next line causing graphic anomalies when it's customized with anything like background, underline, overline etc.
How to reproduce: Start a new Emacs instance with the command "emacs -Q". Issue find-file and create a new org file buffer and insert just the following two lines of text (i.e. an empty source block): #+begin_src #+end_src Place the cursor at the end of the 2nd line (which should also be the last character in the buffer), i.e like here: #+end_src[_] And issue the describe-face command. You will notice it's using the default face. Now run the open-line command (C-o by default) in order to insert a new line below, and rerun the describe-face from the same cursor position. You will notice now that we get the org-block-end-line face (which is in accordance to how the face org-block-begin-line is working). So far so good. Now from this same position press the Enter key. This should move the cursor to the start of the third line of our buffer. Now issue the describe-face command again. You will notice that the org-block-end-line face still applies on the new line (while the right face here would be the default). If we start writing something on the third line, the org-block-end-line face goes away and default face comes in, "fixing" the issue. Now this is becoming really annoying when you have a theme that you customize org-block-end-line with :extend t and anything like :background, :box, :underline, :overline. The face would propagate on the next line, and create ugly artifacts on the screen. ------------------------------------------------------------------------ Emacs : GNU Emacs 29.1 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw3d scroll bars) of 2023-08-30, modified by Debian Package: Org mode version 9.6.6 (release_9.6.6 @ /usr/share/emacs/29.1/lisp/org/) current state: ============== (setq org-link-elisp-confirm-function 'yes-or-no-p org-bibtex-headline-format-function #[257 "\300\236A\207" [:title] 3 "\n\n(fn ENTRY)"] org-persist-after-read-hook '(org-element--cache-persist-after-read) org-export-before-parsing-hook '(org-attach-expand-links) org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand) org-archive-hook '(org-attach-archive-delete-maybe) org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-show-empty-lines org-cycle-optimize-window-after-visibility-change org-cycle-display-inline-images) org-persist-before-read-hook '(org-element--cache-persist-before-read) org-mode-hook '(#[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-fold-show-all append local] 5] #[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-babel-show-result-all append local] 5] org-babel-result-hide-spec org-babel-hide-all-hashes) org-confirm-shell-link-function 'yes-or-no-p outline-isearch-open-invisible-function 'outline-isearch-open-invisible org-agenda-before-write-hook '(org-agenda-add-entry-text) org-src-mode-hook '(org-src-babel-configure-edit-buffer org-src-mode-configure-edit-buffer) org-confirm-elisp-link-function 'yes-or-no-p org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate) org-persist-directory "/tmp/org-persist-NEwgDE" org-fold-core-isearch-open-function 'org-fold--isearch-reveal org-persist-before-write-hook '(org-element--cache-persist-before-write) org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand) org-link-shell-confirm-function 'yes-or-no-p org-babel-pre-tangle-hook '(save-buffer) org-agenda-loop-over-headlines-in-active-region nil org-occur-hook '(org-first-headline-recenter) org-metadown-hook '(org-babel-pop-to-session-maybe) org-link-parameters '(("attachment" :follow org-attach-follow :complete org-attach-complete-link) ("id" :follow org-id-open) ("eww" :follow org-eww-open :store org-eww-store-link) ("rmail" :follow org-rmail-open :store org-rmail-store-link) ("mhe" :follow org-mhe-open :store org-mhe-store-link) ("irc" :follow org-irc-visit :store org-irc-store-link :export org-irc-export) ("info" :follow org-info-open :export org-info-export :store org-info-store-link :insert-description org-info-description-as-command) ("gnus" :follow org-gnus-open :store org-gnus-store-link) ("docview" :follow org-docview-open :export org-docview-export :store org-docview-store-link) ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link) ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete org-bbdb-complete-link :store org-bbdb-store-link) ("w3m" :store org-w3m-store-link) ("doi" :follow org-link-doi-open :export org-link-doi-export) ("file+sys") ("file+emacs") ("shell" :follow org-link--open-shell) ("news" :follow #[514 "\301\300\302Q\"\207" ["news" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("mailto" :follow #[514 "\301\300\302Q\"\207" ["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("https" :follow #[514 "\301\300\302Q\"\207" ["https" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("http" :follow #[514 "\301\300\302Q\"\207" ["http" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("ftp" :follow #[514 "\301\300\302Q\"\207" ["ftp" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("help" :follow org-link--open-help :store org-link--store-help) ("file" :complete org-link-complete-file) ("elisp" :follow org-link--open-elisp)) org-metaup-hook '(org-babel-load-in-session-maybe) )