idle: retry suspend when a logind sleep inhibitor is released (#3866)

quickshell/Services/IdleService.qml

@@ -67,6 +67,12 @@ Singleton {
     property bool isShellLocked: false
     property bool isSessionLockSecure: false
     property bool lockPowerOffRequested: false
+    property bool sleepBlocked: false
+
+    function _updateSleepBlocked(blockInhibited) {
+        if (typeof blockInhibited === "string")
+            sleepBlocked = blockInhibited.split(":").includes("sleep");
+    }
 
     function reapplyDpmsIfNeeded() {
         if (monitorsOff)
@@ -170,6 +176,22 @@ Singleton {
         }
     }
 
+    Connections {
+        target: DMSService
+
+        function onCapabilitiesReceived() {
+            if (!DMSService.capabilities.includes("dbus"))
+                return;
+            DMSService.dbusSubscribe("system", "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.DBus.Properties", "PropertiesChanged");
+            DMSService.dbusGetProperty("system", "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "BlockInhibited", r => root._updateSleepBlocked(r.result?.value));
+        }
+
+        function onDbusSignalReceived(subscriptionId, data) {
+            if (data.path === "/org/freedesktop/login1")
+                root._updateSleepBlocked(data.body?.[1]?.BlockInhibited);
+        }
+    }
+
     Connections {
         target: root
         function onRequestMonitorOff() {
@@ -197,5 +219,13 @@ Singleton {
         _rearmIdleMonitors();
     }
 
+    onSleepBlockedChanged: {
+        log.info(sleepBlocked ? "Sleep blocked by logind inhibitor" : "Sleep inhibitor released");
+        if (sleepBlocked || !suspendMonitor.enabled || !suspendMonitor.isIdle)
+            return;
+        log.info("Sleep inhibitor released while idle, retrying suspend");
+        requestSuspend();
+    }
+
     Component.onCompleted: _applyMonitorEnableds()
 }