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This is useful to avoid repeating the same code e.g. in the Details settings panel. Note that it's possible that both the display manager and the user session run gnome-session, and that they both share the same X server. In that case, we need to store the renderer string as an X property on the root window (like the helper already does for other properties). https://bugzilla.gnome.org/show_bug.cgi?id=686806
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