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diff --git a/src/gui/idlesession_inhibitor.h b/src/gui/idlesession_inhibitor.h
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+/*
+   (This file was initially copied from qBittorrent.)
+
+   Copyright (C) 2019  Vladimir Golovnev <glassez@yandex.ru>
+                       Frédéric Brière <fbriere@fbriere.net>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef IDLESESSION_INHIBITOR_H
+#define IDLESESSION_INHIBITOR_H
+
+#include <QObject>
+
+// Forward declaration
+QT_BEGIN_NAMESPACE
+class QDBusPendingCallWatcher;
+QT_END_NAMESPACE
+
+// Object tasked with inhibiting idle sessions via D-Bus
+class IdleSessionInhibitor : public QObject
+{
+	Q_OBJECT
+
+public:
+	IdleSessionInhibitor(QObject *parent = 0);
+
+	void requestBusy();
+	void requestIdle();
+
+private slots:
+	// Handle the reply to our (un)inhibit request
+	void onAsyncReply(QDBusPendingCallWatcher *call);
+
+private:
+	// Internal state of the inhibitor
+	enum _state
+	{
+		error,
+		busy,
+		idle,
+		request_busy,
+		request_idle
+	};
+	// Current state
+	enum _state m_state;
+	// Most recent idle/busy setting, possibly pending while we're waiting
+	// for a reply to our previous D-Bus call
+	enum _state m_intended_state;
+
+	// Cookie returned by Inhibit(), to be passed to Uninhibit()
+	unsigned int m_cookie;
+
+	// Whether or not we are dealing with GNOME Session
+	bool m_use_gsm;
+
+	// Send an (un)inhibit request via D-Bus
+	void sendRequest(bool inhibit);
+
+	// Display and log a warning
+	void issueWarning(const QString &msg) const;
+};
+
+#endif // IDLESESSION_INHIBITOR_H