Show login UI on all monitors for compositor-agnostic focus

Wayland does not expose absolute pointer coordinates to clients,
so we cannot reliably detect which monitor has focus. Instead,
show the full lockscreen UI on every monitor — the compositor
assigns keyboard focus to the surface under the pointer via
ext-session-lock-v1.

Share a single FingerprintListener across all windows to avoid
multiple device claims. Also add makepkg build artifacts to
gitignore.

.gitignore

@@ -5,3 +5,9 @@ __pycache__/
 dist/
 build/
 .pytest_cache/
+
+# makepkg build artifacts
+pkg/src/
+pkg/pkg/
+pkg/moonlock/
+pkg/*.pkg.tar.*

pkg/PKGBUILD

@@ -4,7 +4,7 @@
 # Maintainer: Dominik Kressler
 
 pkgname=moonlock-git
-pkgver=0.1.0
+pkgver=0.0.0.r8.0eefe76
 pkgrel=1
 pkgdesc="A secure Wayland lockscreen with GTK4, PAM and fingerprint support"
 arch=('any')

src/moonlock/lockscreen.py

@@ -23,7 +23,8 @@ class LockscreenWindow(Gtk.ApplicationWindow):
     """Fullscreen lockscreen window with password and fingerprint auth."""
 
     def __init__(self, application: Gtk.Application, unlock_callback: callable | None = None,
-                 config: Config | None = None) -> None:
+                 config: Config | None = None,
+                 fingerprint_listener: FingerprintListener | None = None) -> None:
         super().__init__(application=application)
         self.add_css_class("lockscreen")
 
@@ -33,8 +34,8 @@ class LockscreenWindow(Gtk.ApplicationWindow):
         self._failed_attempts = 0
         self._unlock_callback = unlock_callback
 
-        # Fingerprint listener
-        self._fp_listener = FingerprintListener()
+        # Fingerprint listener (shared across windows to avoid multiple device claims)
+        self._fp_listener = fingerprint_listener or FingerprintListener()
         self._fp_available = (
             self._config.fingerprint_enabled
             and self._fp_listener.is_available(self._user.username)
@@ -44,8 +45,8 @@ class LockscreenWindow(Gtk.ApplicationWindow):
         self._setup_keyboard()
         self._password_entry.grab_focus()
 
-        # Start fingerprint listener if available
-        if self._fp_available:
+        # Start fingerprint listener if available (only once across shared instances)
+        if self._fp_available and not self._fp_listener._running:
             self._fp_listener.start(
                 self._user.username,
                 on_success=self._on_fingerprint_success,

src/moonlock/main.py

@@ -17,7 +17,8 @@ gi.require_version("Gtk", "4.0")
 gi.require_version("Gdk", "4.0")
 from gi.repository import Gtk, Gdk
 
-from moonlock.config import load_config, resolve_background_path
+from moonlock.config import load_config
+from moonlock.fingerprint import FingerprintListener
 from moonlock.lockscreen import LockscreenWindow
 
 # ext-session-lock-v1 via gtk4-layer-shell
@@ -56,27 +57,17 @@ class MoonlockApp(Gtk.Application):
         display = Gdk.Display.get_default()
         monitors = display.get_monitors()
 
+        # Shared fingerprint listener across all windows (only one can claim the device)
+        fp_listener = FingerprintListener()
+
         for i in range(monitors.get_n_items()):
             monitor = monitors.get_item(i)
-            # Primary monitor gets the full UI
-            if i == 0:
-                window = LockscreenWindow(
-                    application=self,
-                    unlock_callback=self._unlock,
-                    config=self._config,
-                )
-            else:
-                # Secondary monitors get the wallpaper without login UI
-                window = Gtk.ApplicationWindow(application=self)
-                window.add_css_class("lockscreen")
-                wallpaper = Gtk.Picture.new_for_filename(
-                    str(resolve_background_path(self._config))
-                )
-                wallpaper.set_content_fit(Gtk.ContentFit.COVER)
-                wallpaper.set_hexpand(True)
-                wallpaper.set_vexpand(True)
-                window.set_child(wallpaper)
-
+            window = LockscreenWindow(
+                application=self,
+                unlock_callback=self._unlock,
+                config=self._config,
+                fingerprint_listener=fp_listener,
+            )
             self._lock_instance.assign_window_to_monitor(window, monitor)
             window.present()
             self._windows.append(window)