bug#81561: 31.0.91; speedbar-window-mode creates stale idle timers

> Date: Wed, 05 Aug 2026 17:51:22 +0200
> From: Daniel Mendler via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email protected]>
> 
> The new `speedbar-window-mode' (Emacs 31) leaves stale idle timers
> around. In order to reproduce:
> 
> 1. emacs -Q
> 2. M-x speedbar-window-mode (repeat a few times)
> 3. M-x list-timers => Multiple idle timers are present
>    (dframe-timer-fn) while there should only be a single one.
> 
> Alternatively:
> 
> 1. emacs -Q
> 2. (setq speedbar-prefer-window t)
> 3. M-x speedbar (repeat a few times)
> 4. M-x list-timers => Multiple idle timers are present
>    (dframe-timer-fn) while there should only be a single one.
> 
> When testing with frames (without speedbar-window-mode) I don't observe
> the problem and there is always only a single dframe-timer-fn idle
> timer.

Thanks.  Vincenzo, could you please look into fixing this?

> In GNU Emacs 31.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.49, cairo version 1.18.4) of 2026-07-30
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
> System Description: Debian GNU/Linux 13 (trixie)
> 
> Configured using:
>  'configure --prefix=$HOME/.local/share/emacs-install
>  --without-compress-install --with-tree-sitter=ifavailable
>  --with-native-compilation --with-dbus --without-selinux
>  --without-threads --disable-gc-mark-trace --without-gsettings
>  --without-gpm --with-cairo --with-cairo-xcb --with-xinput2
>  --with-x-toolkit=gtk3 --without-toolkit-scroll-bars 'CFLAGS=-O3
>  -mtune=native -march=native''
> 
> Configured features:
> CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ JPEG LIBOTF LIBSYSTEMD
> LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
> SOUND SQLITE3 TIFF TREE_SITTER WEBP X11 XCOMPOSITE XDBE XFIXES XIM
> XINERAMA XINPUT2 XPM XRANDR XRENDER XSHAPE XSYNC GTK3 ZLIB
> 
> 
> 
>