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Changed parameters for template providers

Starting with Joomla 4.0 we changed / removed and added some options to the core extensions that might affect template providers.

Errors reported​

Some options have been removed or changed in comparision to 3.x

Versions affected​

General Information

This pertains only to Joomla! version(s): 4.0.0+

What is the cause​

This is an expected behavior as of Joomla 4.0

The following options has been changed comparing the current 3.10-dev vs. 4.0-dev (as of 09.09.2020):

com_config/config/default:
  Fields added in J4:
    request/request/controller

com_config/templates/default:
  Fields added in J4:
    request/request/controller

com_contact/categories/default:
  Fields removed in J4:
    params/contact/presentation_style

com_contact/category/default:
  Fields added in J4:
    params/advanced/contacts_display_num
  Fields removed in J4:
    params/contact/presentation_style

com_contact/contact/default:
  Fields removed in J4:
    params/params/presentation_style

com_contact/featured/default:
  Fields removed in J4:
    params/contact/presentation_style

com_content/article/default:
  Fields removed in J4:
    params/basic/show_icons
    params/basic/show_print_icon
    params/basic/show_email_icon

com_content/categories/default:
  Fields removed in J4:
    params/blog/num_columns
    params/blog/multi_column_order
    params/article/show_icons
    params/article/show_print_icon
    params/article/show_email_icon

com_content/category/blog:
  Fields added in J4:
    params/advanced/blog_class_leading
    params/advanced/blog_class
  Fields removed in J4:
    params/advanced/bloglayout
    params/advanced/num_columns
    params/advanced/multi_column_order
    params/article/show_icons
    params/article/show_print_icon
    params/article/show_email_icon

com_content/category/default:
  Fields removed in J4:
    params/article/show_icons
    params/article/show_print_icon
    params/article/show_email_icon

com_content/featured/default:
  Fields added in J4:
    params/advanced/blog_class_leading
    params/advanced/blog_class
  Fields removed in J4:
    params/advanced/num_columns
    params/advanced/multi_column_order
    params/article/show_icons
    params/article/show_print_icon
    params/article/show_email_icon

com_finder/search/default:
  Fields added in J4:
    params/basic/show_taxonomy
    params/basic/show_date

How to fix​

When you have a template that supports both 3.x and 4.x please make sure that you take care of the changed parameter set.