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--- src/appsys/AppSystem.vala
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+++ src/appsys/AppSystem.vala
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@@ -70,7 +70,7 @@ public class AppSystem : GLib.Object
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}
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private void signal_received(GLib.DBusConnection connection,
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- string sender,
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+ string? sender,
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string object_path,
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string interface_name,
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string signal_name,
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