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Avoid using a stale timestamp (from the last user interaction with the application) when a message arrives from D-Bus requesting that a new window be created. In this case the most-correct thing that we can do is to use no timestamp at all. We modify gdk_x11_display_set_startup_notification_id() to allow a NULL value to mean "reset everything" and then call this function unconditionally on receipt of D-Bus activation requests. The result will be that a missing desktop-startup-id in the platform-data struct will reset the timestamp. Under their default configuration metacity and mutter will both map windows presented with no timestamp in the foreground. This could result in false-positive, but there is very little we can do about that without the original timestamp from the user event. https://bugzilla.gnome.org/show_bug.cgi?id=752000
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