Write the contents of the file being dragged out of the web view into
|writer|. Returns the number of bytes sent to |writer|. If |writer| is
NULL this function will return the size of the file contents in bytes.
Call get_file_name() to get a suggested name for the file.
Write the contents of the file being dragged out of the web view into |writer|. Returns the number of bytes sent to |writer|. If |writer| is NULL this function will return the size of the file contents in bytes. Call get_file_name() to get a suggested name for the file.