[5.3] Admin: Contact view does not load with a large user base

[brianteeman]

Pull Request for Issue #41187 .

Summary of Changes

This PR removes the ability when using batch functions to set/change the linked user. As this loads all users on the site into a giant list it impacts performance of all functionality in the contact component list view. With enough users it can even prevent the page from loading.

I can't see a valid use case for even having the functionality to link multiple contacts to the same user.

The field to select the users is therefore removed from the batch modal and the related files and strings are therefore marked as deprecated without replacement

Testing Instructions

Open the batch modal for the contact manager

Actual result BEFORE applying this Pull Request

Option to mass set linked user

Expected result AFTER applying this Pull Request

Option no longer present

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[fgsw]

I have tested this item ✅ successfully on f5db2d4

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[obuisard]

I have tested this item ✅ successfully on f5db2d4

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[AndySDH]

I have tested this item ✅ successfully on f5db2d4

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[alikon]

RTC

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[laoneo]

I know this is more a user backwards compatibility break and doesn't fall into our bc policy. If necessary I would like to remove stuff only in a major version, except when it is urgent, which is here not the case. An admin can do a layout override now till 6.0 is released.

[brianteeman]

I disagree. This is a bug fix. Telling someone to create an override to fix a bug is not the correct thing to do. As per the original bug report this useless function prevents the correct operation of anything in the com_contact list view as the query is run on page load and not just when the modal opens