Automatically mounting USB sticks

Greetings,

since my migration to Gentoo years ago I had configured my system to au-
tomatically mount an inserted USB stick at "/run/media/rainer/", display
a message in the upper right corner of my desktop  which looked at least
similar to the messages  displayed via command  "libnotify-notify-send",
and then I could change into that directory and work on the files on the
USB stick.

In my old notes of setting-up Gentoo  I didn't find anything about how I
achieved that, but perhaps the description above is ringing a bell some-
where.   Mind that my description  does NOT fit package  "net-fs/autofs"
which automounts some device  as soon as one accesses the mountpoint and
which is not installed.

Yesterday I did a routine Gentoo upgrade  and built new kernel "sys-ker-
nel/gentoo-sources-6.18.18".   After this  the procedure  of inserting a
USB stick and waiting until it had been mounted at  "/run/media/rainer/"
still worked as normal and allowed me  to save the upgrade change log on
the USB stick before I shutdown my laptop.

Today I booted the new kernel, inserted a USB stick but it was no longer
mounted automatically.   So I rebooted into the old kernel which now be-
haved exactly the same: no mounting whatsoever :-(

Thus the odds are  that some of the packages  upgraded yesterday now re-
quire different USE flags for providing what I was used to.   But which?
Here is the list of the packages processed yesterday:

   >>> kde-frameworks/ksecretd-services-6.23.0
   >>> dev-lang/rust-common-1.92.0
   >>> sys-devel/m4-1.4.21
   >>> sys-firmware/intel-microcode-20260227_p20260227
   >>> dev-libs/openssl-3.5.5-r2
   >>> net-libs/gnutls-3.8.12
   >>> sys-apps/less-692
   >>> app-editors/nano-8.7.1
   >>> sys-apps/ed-1.22.5
   >>> net-misc/rsync-3.4.1-r2
   >>> dev-tcltk/blt-2.5.3-r4
   >>> dev-tcltk/tix-8.4.3-r5
   >>> sys-libs/pam-1.7.2
   >>> sys-apps/util-linux-2.41.3-r1
   >>> sys-process/procps-4.0.5-r4
   >>> kde-frameworks/extra-cmake-modules-6.23.0
   >>> sys-fs/cryptsetup-2.8.4
   >>> sys-apps/openrc-0.63-r1
   >>> sys-fs/fuse-common-3.10.4-r3
   >>> dev-libs/elfutils-0.194-r1
   >>> sys-devel/binutils-2.46.0
   >>> media-gfx/exiv2-0.28.8
   >>> sys-kernel/gentoo-sources-6.18.18
   >>> sys-apps/man-pages-6.16-r2
   >>> kde-frameworks/breeze-icons-6.23.0
   >>> dev-lang/rust-1.92.0_p1-r1
   >>> app-antivirus/clamav-1.5.2
   >>> kde-frameworks/kwidgetsaddons-6.23.0
   >>> kde-frameworks/karchive-6.23.0
   >>> kde-frameworks/kdbusaddons-6.23.0
   >>> kde-frameworks/kitemviews-6.23.0
   >>> kde-frameworks/kcodecs-6.23.0
   >>> kde-frameworks/kglobalaccel-6.23.0
   >>> kde-frameworks/threadweaver-6.23.0
   >>> kde-frameworks/kdoctools-6.23.0
   >>> kde-frameworks/kimageformats-6.23.0
   >>> kde-frameworks/kconfig-6.23.0
   >>> kde-frameworks/kcoreaddons-6.23.0
   >>> kde-frameworks/ki18n-6.23.0
   >>> kde-frameworks/kguiaddons-6.23.1
   >>> kde-frameworks/kwindowsystem-6.23.0
   >>> kde-frameworks/sonnet-6.23.0
   >>> kde-frameworks/solid-6.23.0
   >>> kde-frameworks/kservice-6.23.1
   >>> kde-frameworks/kcolorscheme-6.23.0
   >>> kde-frameworks/kcompletion-6.23.0
   >>> kde-frameworks/kcrash-6.23.0
   >>> kde-frameworks/kpty-6.23.0
   >>> kde-frameworks/kiconthemes-6.23.0
   >>> kde-frameworks/kconfigwidgets-6.23.0
   >>> kde-frameworks/ktextwidgets-6.23.0
   >>> kde-frameworks/kded-6.23.0
   >>> kde-frameworks/kxmlgui-6.23.0
   >>> kde-frameworks/kbookmarks-6.23.0
   >>> kde-frameworks/knotifications-6.23.0
   >>> kde-frameworks/kjobwidgets-6.23.0
   >>> media-video/wireplumber-0.5.13_p20260216
   >>> media-video/ffmpeg-8.0.1
   >>> www-client/firefox-bin-148.0.2
   >>> media-libs/opencv-4.12.0-r1
   >>> media-video/vlc-3.0.23
   >>> kde-frameworks/kwallet-6.23.0
   >>> kde-frameworks/kwallet-runtime-6.23.0
   >>> kde-frameworks/kio-6.23.0
   >>> kde-frameworks/kparts-6.23.0
   >>> kde-frameworks/kcmutils-6.23.0
   <<< dev-lang/rust-1.89.0
   <<< sys-devel/binutils-2.45.1
   <<< sys-kernel/gentoo-sources-6.12.41
   <<< sys-kernel/gentoo-sources-6.12.58

Anybody having some idea?  Any pointers welcome :-)

Sincerely,
  Rainer