Added force screensaver on lock

src/bridge/Greeter.py

@@ -108,6 +108,10 @@ class Greeter(BridgeObject):
 
         self._connect_signals()
         self._determine_shared_data_directory_path()
+
+        if LightDMGreeter.get_lock_hint():
+            screensaver.force_screensaver(True)
+
         logger.debug("LightDM API connected")
 
     def _determine_shared_data_directory_path(self):

src/utils/screensaver.py

@@ -1,3 +1,4 @@
+from Xlib import X
 from Xlib.display import Display
 from Xlib.error import DisplayError
 from logger import logger
@@ -52,4 +53,8 @@ class Screensaver:
         self.saved = False
         logger.debug("Screensaver reset")
 
+    def force_screensaver(self, value: bool):
+        """Force screensaver"""
+        self.display.force_screen_saver(X.ScreenSaverActive if value else X.ScreenSaverReset)
+
 screensaver = Screensaver()