bug#62299: 29.0.60; NS port incorrect rendering

[Kai Ma]

Hi emacs hackers,

I'm recently seeing quite a few "tearings" on the NS port: sometimes
some parts of the display are not cleared correctly, and sometimes some
parts are not drawn.  (I'm not sure if "tearing" is the correct term.)

In one case: the majority of the frame is cleared, but was not updated.

telega.png
Description: almost the whole frame becomes blank

In some other cases, scrolling only scrolls part of the display, and the
display gets unreadable due to that.  One example:

scroll.jpeg
Description: bad scrolling

When this happens, one has to M-x redraw-frame to clear the display and
redraw everything.

At first I thought this problem is infrequent enough not to be bothered,
but soon I find that this problem also happens even when I'm just
coding (the second screenshot attached above).

Unfortunately, I didn't find a 100% guaranteed way to reproduce this
problem.  However, if one is Telega user, they could probably reproduce
this relatively easily.  (Telega [1] is a Telegram client in Emacs.)
I'm able to get incorrect rendering once in <20 minutes using Telega.

Should you need any further information, please let me know.

[1] https://github.com/zevlg/telega.el


In GNU Emacs 29.0.60 (build 10, x86_64-apple-darwin22.3.0, NS
 appkit-2299.40 Version 13.2.1 (Build 22D68)) of 2023-03-16 built on
 Kais-MacBook.local
Repository revision: 499927d4756789f649b9d8aeaecb95a7eb3e3db1
Repository branch: emacs-29
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.2.1

Configured using:
 'configure --with-ns --with-xwidgets --with-json
 PKG_CONFIG_PATH=/usr/local/opt/openssl@3/lib/pkgconfig'

Configured features:
ACL DBUS GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY
KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM XWIDGETS ZLIB

Important settings:
  value of $LC_ALL: zh_CN.utf-8
  value of $LANG: zh_CN.utf-8
  locale-coding-system: utf-8-unix

Major mode: ◁Chat

Minor modes in effect:
  telega-adblock-mode: t
  telega-root-auto-fill-mode: t
  telega-active-video-chats-mode: t
  telega-active-locations-mode: t
  telega-patrons-mode: t
  cursor-sensor-mode: t
  cursor-intangible-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  pdf-occur-global-minor-mode: t
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  shell-dirtrack-mode: t
  treemacs-filewatch-mode: t
  treemacs-follow-mode: t
  treemacs-git-mode: t
  treemacs-fringe-indicator-mode: t
  global-wakatime-mode: t
  wakatime-mode: t
  diff-hl-margin-mode: t
  recentf-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  doom-modeline-mode: t
  winner-mode: t
  winum-mode: t
  which-key-mode: t
  global-hl-line-mode: t
  solaire-global-mode: t
  solaire-mode: t
  projectile-mode: t
  vertico-multiform-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  desktop-save-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  corfu-popupinfo-mode: t
  global-corfu-mode: t
  corfu-mode: t
  marginalia-mode: t
  prescient-persist-mode: t
  global-ligature-mode: t
  ligature-mode: t
  ns-auto-titlebar-mode: t
  pixel-scroll-precision-mode: t
  save-place-mode: t
  server-mode: t
  electric-pair-mode: t
  global-so-long-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/Users/kaima/.emacs.d/elpa/transient-20230315.1520/transient hides 
/Applications/Emacs.app/Contents/Resources/lisp/transient

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Memory information:
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 (vectors 16 161600)
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 (buffers 984 71))