Bring gnome-control-center window to front when already open

When the user clicks 'Change system keyboard layout' in GNOME, if
gnome-control-center is already running, its window should come to the
front instead of staying behind the installer window.

Create a wrapper script gnome-control-center-ext that:
- Uses gapplication launch to activate existing instance (brings window to front)
- Then launches gnome-control-center with keyboard panel argument

Update the desktop file to use this wrapper script instead of calling
gnome-control-center directly.

Resolves: rhbz#2415043

Makefile

@@ -92,7 +92,7 @@ po/LINGUAS:
 #
 all: $(DIST_TEST)
 
-dist_libexec_SCRIPTS = webui-desktop browser-ext
+dist_libexec_SCRIPTS = webui-desktop browser-ext gnome-control-center-ext
 # makes sure it gets built as part of `make` and `make dist`
 dist_noinst_DATA = \
 	$(DIST_TEST) \
@@ -138,6 +138,7 @@ install: $(DIST_TEST) po/LINGUAS
 	mkdir -p $(DESTDIR)/usr/libexec/anaconda
 	cp webui-desktop $(DESTDIR)/usr/libexec/anaconda
 	cp browser-ext $(DESTDIR)/usr/libexec/anaconda
+	cp gnome-control-center-ext $(DESTDIR)/usr/libexec/anaconda
 	cp src/scripts/cockpit-coproc-wrapper.sh $(DESTDIR)/usr/libexec/anaconda/
 	mkdir -p $(DESTDIR)/usr/lib/systemd/system/
 	cp src/systemd/webui-cockpit-ws.service $(DESTDIR)/usr/lib/systemd/system/

anaconda-gnome-control-center.desktop

@@ -1,7 +1,7 @@
 [Desktop Entry]
 Version=1.0
 Name=Keyboard External
-Exec=/usr/bin/gnome-control-center keyboard %u
+Exec=/usr/libexec/anaconda/gnome-control-center-ext keyboard
 Terminal=false
 Type=Application
 MimeType=x-scheme-handler/anaconda-gnome-control-center;
@@ -13,4 +13,4 @@ X-Desktop-File-Install-Version=0.26
 
 [Desktop Action Region]
 Name=Region & Language
-Exec=/usr/bin/gnome-control-center keyboard
+Exec=/usr/libexec/anaconda/gnome-control-center-ext keyboard

gnome-control-center-ext

@@ -0,0 +1,32 @@
+#!/bin/bash
+#
+# Copyright (C) 2025  Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Panel name argument is mandatory
+if [[ -z "$1" ]]; then
+    echo "Error: Panel name argument is required" >&2
+    exit 1
+fi
+
+PANEL="$1"
+
+# Use gapplication to activate existing instance (brings window to front if running)
+# This handles single-instance app activation automatically
+gapplication launch org.gnome.Settings 2>/dev/null
+
+# Launch with panel argument
+# Since gnome-control-center is single-instance, this will switch panels in existing window
+exec /usr/bin/gnome-control-center "$PANEL"

packaging/anaconda-webui.spec.in

@@ -88,6 +88,7 @@ exit 0
 %{_datadir}/anaconda/firefox-theme/extlink/user.js
 %{_libexecdir}/anaconda/webui-desktop
 %{_libexecdir}/anaconda/browser-ext
+%{_libexecdir}/anaconda/gnome-control-center-ext
 %{_datadir}/applications/extlinks.desktop
 %{_datadir}/applications/anaconda-gnome-control-center.desktop
 %{_unitdir}/webui-cockpit-ws.service