Returns the previous gtksource.mark.Mark 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 #GtkSourceMark, or null.
Returns the previous gtksource.mark.Mark 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