The parametered `all` is not preserved after save object in django admin.

[A-hông]

1. Login in django admin
2. Enter a changelist page of model
3. Order by a column in changelist page
4. Display all in changelist page
5. Enter change form page
6. Save
7. The order is kept but all is disappeared

[Mariusz Felisiak]

Thanks for the report, however I don't see any issue here. all in the changelist filters are achieved by removing previous filters from the query string so there is nothing to preserve, in the 7th step a changelist will display all records as expected. If you're having trouble understanding how Django works, see TicketClosingReasons/UseSupportChannels for ways to get help.

[A-hông]

q(query), o(order) and all(display all) can be set at the same time.
q(query) and o(order) are kept but all(display all) not, when from change form back to changelist.

all should be kept in the fillter of changelist.
I found ​parse_qsl in admin_urls.py will remove the keys which has no value.

from urllib.parse import parse_qsl, unquote, urlparse, urlunparse
parse_qsl('q=2&all=')
=> [('q', '2')]

It is why all(display all) cannot be kept.