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Change sets
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GConf has a a concept of a set of changes which can be applied or reverted
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at once: GConfChangeSet (GConf doesn't actually apply changes atomically,
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which is one of its shortcomings).
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Instead of a separate object to represent a change set, GSettings has a
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'delayed-apply' mode, which can be turned on for a GSettings object by
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calling g_settings_delay(). In this mode, changes done to the GSettings
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object are not applied - they are still visible when calling g_settings_get()
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on the same object, but not to other GSettings instances
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or even other processes.
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To apply the pending changes all at once (GSettings does
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atomicity here), call g_settings_apply(). To revert the pending changes,
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call g_settings_revert() or just drop the reference to the GSettings object.
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