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bug#22320: Overlays with an 'invisible property break stacking of overla

From: Clément Pit--Claudel
Subject: bug#22320: Overlays with an 'invisible property break stacking of overlay faces
Date: Wed, 6 Jan 2016 13:04:17 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Hi all,

Adding an 'invisible property to an overlay seems to break stacking of faces.
To reproduce, run the following snippet. The whole buffer should have a red
background, but the invisible section does not inherit that background.

(with-current-buffer (get-buffer-create "bug")
  (add-to-invisibility-spec '(outline . t))
  (insert "line1 line2 line3")
  (let ((ov (make-overlay 7 12)))
    (overlay-put ov 'invisible 'outline))
  (let ((ov (make-overlay 7 8)))
    (overlay-put ov 'face '(:underline t)))
  (let ((ov (make-overlay (point-min) (point-max))))
    (overlay-put ov 'face '(:background "red")))
  (pop-to-buffer (current-buffer)))

I initially thought this was an issue of priorities, but removing the overlay 
the invisible property makes the issue disappear. Similarly, removing the
underline overlay makes the issue disappear.

Here is another (more "real-world") way to reproduce this issue (run the
snippet, then use C-x h in the newly created buffer to mark all text: the
invisible section isn't highlighted)

(with-current-buffer (get-buffer-create "org-bug")
  (insert "* line1\n** line2\n* line3")
  (pop-to-buffer (current-buffer)))

Yet another way it to reproduce it is given below

(with-current-buffer (get-buffer-create "flyspell-bug")
  (add-to-invisibility-spec '(outline . t))
  (insert "line1\nline2\nline3")
  (flyspell-check-region-doublons (point-min) (point-max))
  (let ((ov (make-overlay 7 12)))
    (overlay-put ov 'invisible 'outline))
  (pop-to-buffer (current-buffer)))

Interestingly, the first example is broken in both 24.4 and emacs-25; but the 
second one is broken only in emacs-25 (the third one does not run in Emacs 

I wonder if this is connected to another issue that I've seen, where having a 
composition (using prettify-symbols-mode) just before an invisible region would 
cause the background of the invisible region to be incorrect, but setting 
prettify-symbols-unprettify-at-point and moving the point to the edge of the 
symbol would cause the background to be fine. Unfortunately I don't have a good 
repro for that issue.


In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2015-12-29 built on clem-w50-mint
Repository revision: a21bb238ce7bcc9c13a9cf66db77918304daa2fc
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:     Linux Mint 17.2 Rafaela

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  recentf-mode: t
  ido-ubiquitous-mode: t
  keybindings-global-mode: t
  keybindings-minor-mode: t
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  flycheck-pos-tip-mode: t
  global-company-mode: t
  company-mode: t
  global-page-break-lines-mode: t
  which-key-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  save-place-mode: t
  savehist-mode: t
  xterm-mouse-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

(shadow sort ws-butler flyspell ispell ruler-mode gnus-util mail-extr
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tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
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japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
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hashtable-print-readable backquote dbusbind inotify dynamic-setting
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multi-tty make-network-process emacs)

Memory information:
((conses 16 433672 15194)
 (symbols 48 33265 1)
 (miscs 40 54 211)
 (strings 32 81160 11716)
 (string-bytes 1 2094594)
 (vectors 16 42572)
 (vector-slots 8 774284 7488)
 (floats 8 294 55)
 (intervals 56 2934 164)
 (buffers 976 14)
 (heap 1024 43373 1840))

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