a set of configuration changes to be made.
a <g-conf-change-set> allows you to collect a set of changes to
configuration keys (set/unset operations). You can then commit all the changes
at once. This is convenient for something like a preferences dialog; you can
collect all the pending changes in a <g-conf-change-set>, then when the
user clicks "apply" send them all to the configuration database. The
<g-conf-change-set> allows you to avoid sending every preferences setting
when "apply" is clicked; you only have to send the settings the user changed.
In the future, GConf may also have optimizations so that changing a group of
values with <g-conf-change-set> is faster than calling
gconf-engine-set for each value. In the future,
<g-conf-change-set> may also represent an atomic transaction, where all
or none of the values are set; however, for now the operation is not
atomic.