Fix pagination keys in preserved filters querystring

[qdelcourte]

Hi!

May fix this issue #20

Problem

Changes from the 2nd page onwards are not saved.

Solution

It appears that model change form doesn't contain the action url with pagination key. So when we click on save then Django lose the pagination context and save the wrong formset (default is for page 1).

Inline pagination needs context on each requests:

django-admin-inline-paginator/django_admin_inline_paginator/admin.py

Lines 31 to 37 in 53bf916

	def get_page_num(self) -> int:
	assert self.request is not None
	page = self.request.GET.get(self.pagination_key, '1')
	if page.isnumeric() and page > '0':
	return int(page)
	return 1

Django preserves only _changelist_filters :
https://github.com/django/django/blob/f6f0699d01f5840437bfd236c76c797943ef8edc/django/contrib/admin/options.py#L1039-L1055

Discussions

• I'm not convinced by the use of inline_pagination_keys in ModelAdmin.
• InlineModelPaginated naming