backward_iter_to_source_mark

Description:

public bool backward_iter_to_source_mark (ref TextIter iter, string? category)

Moves `iter` to the position of the previous [class@Mark] of the given category.

Returns true if `iter` was moved. If `category` is NULL, the previous source mark can be of any category.

this	a Buffer.
iter	an iterator.
category	category to search for, or null

whether `iter` was moved.