re-acquire session lock on startup if logind reports session locked

shell/lock/Lock.qml

@@ -40,8 +40,10 @@ Scope {
         }
 
         onExited: {
-            if (root._sessionPath)
+            if (root._sessionPath) {
                 _logindMonitor.running = true;
+                _lockStateCheck.running = true;
+            }
         }
     }
 
@@ -56,7 +58,23 @@ Scope {
             onRead: data => {
                 if (data.indexOf(".Lock ()") !== -1 && root._enabled)
                     _lock.locked = true;
-            // Unlock is PAM-driven, ignore logind Unlock signal
+                else if (data.indexOf(".Unlock ()") !== -1 && _lock.locked)
+                    _lock.locked = false;
+            }
+        }
+    }
+
+    // Check if session is already locked on startup (crash recovery)
+    Process {
+        id: _lockStateCheck
+        running: false
+        command: ["busctl", "get-property", "--system", "org.freedesktop.login1", root._sessionPath, "org.freedesktop.login1.Session", "LockedHint"]
+
+        stdout: SplitParser {
+            onRead: data => {
+                // Output: b true/false
+                if (data.indexOf("true") !== -1 && root._enabled && !_lock.locked)
+                    _lock.locked = true;
             }
         }
     }