I cannot confirm this with the current developer version.

Off topic: I find it confusing that the drop down to change admin / site is still there. If I choose on the left in the menu site, then I expect to switch to admin here.

I can confirm the issue with a current 4.0-dev branch.

I did exactly as described, after filtering the admin modules going back to the Home Dashboard and then on the "Site" panel clicked the big "Modules" button. I.e. I did not use the menu items on the left hand side. After that, the site filter was "Site" for the frontend but no menus were shown. Clear filter button was not enabled. Filtering by a module position which exists on the site (frontend) and then clearing the filter brings back all site modules in the list.

Confirmed.

@richard67
Now you made me feel insecure and I tried again. Maybe I'm still getting something wrong? I really didn't click left in the menu. The site modules still appear for me. Maybe it's also due to the system settings. I don't have any current versions on my test computer:

php: Linux TravelMate-5760G 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64
dbserver: mysql
dbversion: 5.7.31-0ubuntu0.18.04.1
dbcollation: utf8mb4_unicode_ci
dbconnectioncollation: utf8mb4_general_ci
dbconnectionencryption:
dbconnencryptsupported: true
phpversion: 7.2.32-1+ubuntu18.04.1+deb.sury.org+1
server: Apache/2.4.29 (Ubuntu)
sapi_name: apache2handler
version: Joomla! 4.0.0-beta4-dev Development [ Mañana ] 29-July-2020 18:21 GMT
useragent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0

@astridx Thanks for testing again. And of course I believe you. We are using same server OS (Ubuntu), so it must be something else.

@astridx What’s your session handler? Database (which is default on a new installation), or PHP?

I'm so sorry. I misunderstood that. I have now done the following:

1. Content | Administrator Modules
2. Filter set on Cpanel
3. Site selected in the drop down on the top and in the left admin menu

Now I actually didn't see a module even though the filter was deleted.

The filter was deleted because this function is called when the selection is changed:

But form.submit(); in line 41 is undefined.

Please test PR #30323

Reopening as requested in #30323 (comment) .

I think now i found the reason for the problem. Before I rush to do something, I would like to check this out with you.

Because oft the change here https://github.com/joomla/joomla-cms/pull/24801/files#diff-245b1879403befd92899430e9ad5d673 the URL changed, if we switch from site to admin (the url has changed in several places).

That is why the input-object does not have an entry in the data array for the filters. (So we could have saved ourselves the reset via Joomla.resetFilters.)

So $filters is empty here

That is why the list model used a fall back (BC for Search Tools which uses different naming) to old state of the filters.

It is not immediately noticeable in other components. But here it is like this: if we select the position cpanel for admin and then switch to the site the list view is empty, because we do not have the position cpanel for the site.

We have this problem not only when we change the URL. It also when we click on a menu item in the left side panel. That is why the form is not submitted in this case, too.

How do we best solve this problem?

I think it is ok that the view is empty, as filtering for cpanel gives an empty list.
The error is that position cpanel is not visible in the filter bar. Searchtools mus be closed if no filter is active or at least one filter field must have a selected option.

I think it is ok that the view is empty, as filtering for cpanel gives an empty list.
The error is that position cpanel is not visible in the filter bar. Searchtools mus be closed if no filter is active or at least one filter field must have a selected option.

@chmst Thank you for your feedback.
It would also be wrong if, after switching from admin to site, cpanel would stay in the position field, although this position does not exist in the site, right?
In the case of option=com_templates&view=styles the number of filter fields even changes. For site there is menu_item and template. For admin there is only a template to choose from. Therefore I think that the filter fields have to be reseted when changing client_id.

I would prefer to use a static action url in the form, but to include the client ID as a hidden field.
But this solution is only good for the select field that changed the client_id, not if you change view via the admin menu on the left side. Therefore I would integrate only one entry for the modules in the menu on the left. This would open the site by default and with the drop down you can then switch to admin.

It would also be wrong if, after switching from admin to site, cpanel would stay in the position field, although this position does not exist in the site, right?

At least it would explain what was the filter and why the result is empty.

To have only one link to (site) modules as in 3.9 - sound like a good idea.

@wilsonge Do you think this could be a release blocker? From my point of view itr could be. We end up in an empty list view without any visibly active filter and so getting wrong information.

Please test PR #30577

Re-opening this issue since PR #30577 has been closed meanwhile.

Please test PR #33763. Thanks.