bug#63186: closed (30.0.50; Modeline is not fully repainted when being set to nil then back to having content)

[GNU bug Tracking System]

Your message dated Sun, 30 Apr 2023 10:48:10 -0400
with message-id 
<CAHyO48yq=4Boj=qWtU_SdUC8nPS0r2x1SkYnbznpPTUAZZz7hw@mail.gmail.com>
and subject line Re: bug#63186: 30.0.50; Modeline is not fully repainted when 
being set to nil then back to having content
has caused the debbugs.gnu.org bug report #63186,
regarding 30.0.50; Modeline is not fully repainted when being set to nil then 
back to having content
to be marked as done.

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63186: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63186
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> --- Begin Message ---
>
>
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> Subject: 
>
> 30.0.50; Modeline is not fully repainted when being set to nil then back to having content
>
>
>
>
> Date: 
>
> Sun, 30 Apr 2023 05:54:50 -0400
>
>
>
>
> >From emacs -Q:
>
> In the scratch buffer, eval:
>
> (setq mode-line-format "foo")
> (setq mode-line-format nil)
> (setq mode-line-format "boo")
>
> After the last line, only the "b" of the mode line will be rendered.
> Triggering a repaint with M-x or resizing the window causes the entire
> mode line to repaint.
>
> If the buffer has enough content in it such that there is text where the
> mode line is when it is set to `nil', most of that text will remain
> painted in place when the mode line is set to "boo".
>
> While this seems niche, I use a header-line for most things that Emacs
> uses a mode line for by default. The mode line is enabled only
> occasionally to display things like the number of matches when
> searching. It is usually set to `nil', so I see this artifact all the time.
>
>
> In GNU Emacs 30.0.50 (build 1, aarch64-apple-darwin22.4.0, NS
>  appkit-2299.50 Version 13.3.1 (Build 22E261)) of 2023-04-09 built on
>  Aarons-Laptop.local
> Windowing system distributor 'Apple', version 10.3.2299
> System Description:  macOS 13.3.1
>
> Configured using:
>  'configure --disable-dependency-tracking --disable-silent-rules
>  --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp
>  --infodir=/opt/homebrew/Cellar/emacs-plus@30/30.0.50/share/info/emacs
>  --prefix=/opt/homebrew/Cellar/emacs-plus@30/30.0.50 --with-xml2
>  --with-gnutls --with-native-compilation --without-compress-install
>  --without-dbus --without-imagemagick --with-modules --with-rsvg
>  --with-ns --disable-ns-self-contained 'CFLAGS=-Os -w -pipe
>  -mmacosx-version-min=13
>  -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
>  -DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT'
>  'CPPFLAGS=-I/opt/homebrew/opt/zlib/include
>  -I/opt/homebrew/opt/jpeg/include -I/opt/homebrew/opt/icu4c/include
>  -I/opt/homebrew/opt/openssl@1.1/include -isystem/opt/homebrew/include
>  -F/opt/homebrew/Frameworks
>  -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk'
>  'LDFLAGS=-L/opt/homebrew/opt/zlib/lib -L/opt/homebrew/opt/jpeg/lib
>  -L/opt/homebrew/opt/icu4c/lib -L/opt/homebrew/opt/openssl@1.1/lib
>  -L/opt/homebrew/lib -F/opt/homebrew/Frameworks
>  -Wl,-headerpad_max_install_names
>  -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk''
>
> Configured features:
> ACL GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
> NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
> TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#63186: 30.0.50; Modeline is not fully repainted when being set to nil then back to having content
>
>
>
>
> Date: 
>
> Sun, 30 Apr 2023 10:48:10 -0400
>
>
>
>
> On Sun, Apr 30, 2023 at 9:25 AM Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > > From: Aaron Jensen <aaronjensen@gmail.com>
> > > Date: Sun, 30 Apr 2023 05:54:50 -0400
> > >
> > > >From emacs -Q:
> > >
> > > In the scratch buffer, eval:
> > >
> > > (setq mode-line-format "foo")
> > > (setq mode-line-format nil)
> > > (setq mode-line-format "boo")
> > >
> > > After the last line, only the "b" of the mode line will be rendered.
> > > Triggering a repaint with M-x or resizing the window causes the entire
> > > mode line to repaint.
> > >
> > > If the buffer has enough content in it such that there is text where the
> > > mode line is when it is set to `nil', most of that text will remain
> > > painted in place when the mode line is set to "boo".
> >
> > Thanks, should be fixed now on the emacs-29 branch.
> >
> > (This is a regression from Emacs 28, but I have no idea which change
> > caused it.)
>
> Thanks, confirmed. Fixed when merged into Emacs 30 as well.
>
> Aaron
>
>
> --- End Message ---