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Iterates through a model
<clutter-model-iter> is an object used for iterating through all the rows
of a <clutter-model>. It allows setting and getting values on the row
which is currently pointing at.
A <clutter-model-iter> represents a position between two elements of the
sequence. For example, the iterator returned by
clutter-model-get-first-iter represents the gap immediately before the
first row of the <clutter-model>, and the iterator returned by
clutter-model-get-last-iter represents the gap immediately after the last
row.
A <clutter-model-iter> can only be created by a <clutter-model>
implementation and it is valid as long as the model does not change.
<clutter-model-iter> is available since Clutter 0.6