Improved performance of admin changeform_view.

[Hasan Ramezani]

There is a check for formset and form validation in ​ModelAdmin._changeform_view

if all_valid(formsets) and form_validated:

We can change the order of checks to prevent validation of all formsets when form_validated=Flase:

if form_validated and all_valid(formsets):

Here is the ​PR.

[Simon Charette]

I suspect things are done this way for a reason, swapping the order around won't call is_valid on each inline formsets and prevent validation errors from showing up unless the form is valid.

[Mariusz Felisiak]

Thanks for this ticket, however I agree with Simon, we can omit formsets validation if we swap this conditions.