Returns the next gtksource.mark.Mark in the buffer or null if the mark was not added to a buffer.
If there is no next mark, null will be returned.
If category is null, looks for marks of any category.
a string specifying the mark category, or null.
the next #GtkSourceMark, or null.
Returns the next gtksource.mark.Mark in the buffer or null if the mark was not added to a buffer.
If there is no next mark, null will be returned.
If category is null, looks for marks of any category.