forward_iter_to_source_mark
Description:
Moves `iter` to the position of the next [class@Mark] of the given `category`.
Returns true if `iter` was moved. If `category` is NULL, the next source mark can be of any category.
Parameters:
this |
a Buffer. |
iter |
an iterator. |
category |
category to search for, or null |
Returns:
whether `iter` was moved. |