iter to the start of the previous visible line. Returns
iter could be moved; i.e. if
iter was at character offset 0, this
FALSE. Therefore if
iter was already on line 0,
but not at the start of the line,
iter is snapped to the start of
the line and the function returns
TRUE. (Note that this implies that
in a loop calling this function, the line number may not change on
every iteration, if your first iteration is on line 0.)
Derived by RGtkGen from GTK+ documentation
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