fix: the SteamOS theme drops the blank Discover pin from the taskbar (also on the first login of an ISO install)

CHANGELOG.md

@@ -8,6 +8,7 @@ one per merged pull request.
 ## 2.11.0 - 2026-10-01
 
 - `5da1833` **feat: "Start Steam silently" sub-option: under the SteamOS conversion (`silent`, opt-in now: it was always on before; an existing one is moved from its systemd unit to the autostart entry by the "update") and under Gaming on NVIDIA (`nvsilent`, opt-in, not together with Big Picture); the SteamOS one is called "Start Steam silently in desktop mode" and is always shown, also on a Steam Machine; it is Steam's own autostart entry (`~/.config/autostart/steam.desktop`), so Steam's setting "Run Steam when my computer starts" follows it**
+- **fix: the SteamOS theme no longer leaves a blank Discover pin in the taskbar (Plasma's default taskbar pins Discover, which CachyOS doesn't install); the taskbar gets CachyOS's own pins (System Settings, files, browser), also on the ISO's first login**
 - **feat: "Steam Deck/Machine icons" (`glyphs`) is a sub-option of the SteamOS conversion, like "Start Steam silently in desktop mode": it only changes gaming mode**
 
 ## 2.10.0 - 2026-10-01

TECHNICAL.md

@@ -539,7 +539,9 @@ steamify.sh --defaults --list                           # what --defaults can se
 item this PC can't use (e.g. `vram` without a VRAM region) is left off with
 a warning. `--boot desktop` needs `gaming`. Unknown options, ids, `boot` or
 `bios` in the list: exit code 1 before anything changes. What needs a
-Plasma session waits for the first login (`lib/first-login.sh`).
+Plasma session waits for the first login (`lib/first-login.sh`). The same step (and the online theme path) replaces Plasma's default taskbar pins, which include Discover
+(not installed on CachyOS: a blank icon), by CachyOS's own (`taskbar_drop_discover` in `lib/vapor-theme.sh`; skipped when Discover is
+installed or the taskbar already has its own `launchers`).
 
 With `Relogin=true`, a gamescope session that fails to start is restarted
 immediately, which can turn into a loop - see

lib/first-login.sh

@@ -31,10 +31,9 @@ first_login_run() {
         [[ -n "$(plasma_applets org.kde.plasma.kickoff)" ]] && break
         sleep 2
     done
-    if single_status; then
     stop_plasmashell_for_edit
-        single_launcher
+    taskbar_drop_discover
+    single_status && single_launcher
     restart_plasmashell_if_stopped
-    fi
     return 0
 }

lib/vapor-theme.sh

@@ -106,17 +106,32 @@ theme_enable() {
     # SteamOS panel, launcher icon and wallpaper. It needs plasmashell up.
     lookandfeeltool -a "$VAPOR_LOOKANDFEEL" --resetLayout >/dev/null 2>&1 ||
         { err "lookandfeeltool failed."; return 1; }
-    # The new layout has a new launcher, without single user's settings.
+    # The new layout has a new launcher, without single user's settings, and the default taskbar pins.
-    if single_status; then
     sleep 3
     stop_plasmashell_for_edit
-        single_launcher
+    taskbar_drop_discover
+    single_status && single_launcher
     restart_plasmashell_if_stopped
-    fi
     extras_enable || warn "SteamOS desktop extras not installed (see above); the theme itself is on."
     ok "Vapor theme active."
 }
 
+taskbar_drop_discover() {
+    # Plasma's default taskbar pins Discover, which CachyOS doesn't install: the pin shows as a
+    # blank icon. Pin what CachyOS's own layout pins (/etc/skel) instead. Not when Discover is
+    # installed, and only on a taskbar that still has the default pins (no launchers key).
+    # Edit only while plasmashell is stopped.
+    [[ -e /usr/share/applications/org.kde.discover.desktop ]] && return 0
+    local applet grp
+    for applet in $(plasma_applets org.kde.plasma.icontasks); do
+        grp="Containments|${applet%%:*}|Applets|${applet#*:}|Configuration|General"
+        [[ -n "$(kreadconfig6 --file plasma-org.kde.plasma.desktop-appletsrc --group Containments --group "${applet%%:*}" \
+            --group Applets --group "${applet#*:}" --group Configuration --group General --key launchers)" ]] && continue
+        kset theme plasma-org.kde.plasma.desktop-appletsrc "$grp" launchers \
+            'applications:systemsettings.desktop,preferred://filemanager,preferred://browser'
+    done
+}
+
 theme_disable() {
     extras_disable
     info "Restoring the previous desktop look and layout..."