EmailMessage.get_filename() not unquoting url encodings

Bug report

Bug description:

import requests
from email.message import EmailMessage

def get_filename_from_url(url, url_response=None):
    if url_response == None:
        url_response = requests.get(url)
        url_response.raise_for_status()
    
    content_disposition = url_response.headers.get("Content-Disposition")
    if content_disposition:
        email_message = EmailMessage()
        email_message["Content-Disposition"] = content_disposition
        return email_message.get_filename()


url = "https://www.gsi.gov.in/webcenter/ShowProperty;jsessionid=yv2xehEKwHR0ZHf64V2sMbrFzRSeSGCvcxDVr9F4_rbXBVtcgKbl!1598077039!1556223610?nodeId=%2FUCM%2FDCPORT1GSIGOVI063041%2F%2FidcPrimaryFile&revision=latestreleased"
get_filename_from_url(url)

output

annoncement_of%20computer%20application%20_rti_er%20_16122014.pdf

if i use

from urllib.parse import unquote
unquote(email_message.get_filename())

i am getting unquoted output

annoncement_of computer application _rti_er _16122014.pdf

why a different unquote function is used in EmailMessage.get_filename() ?

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Beginne beim Einstiegspunkt EmailMessage.get_filename() und reproduziere das gemeldete Content-Disposition-Verhalten mit der bereitgestellten URL und dem Headerwert. Vergleiche sein Dekodierungsverhalten mit urllib.parse.unquote, ermittle anschließend die erwartete Behandlung des Dateinamens und füge Regressionstests hinzu oder aktualisiere sie, falls der Issue einen Fehler bestätigt.