Returns the previous gsv.SourceMark in the buffer or NULL if the mark was not added to a buffer. If there is no previous mark, NULL is returned.
If category is NULL, looks for marks of any category
a string specifying the mark category, or NULL.
the previous gsv.SourceMark, or NULL.
2.2
Returns the previous gsv.SourceMark in the buffer or NULL if the mark was not added to a buffer. If there is no previous mark, NULL is returned.
If category is NULL, looks for marks of any category