[6.0] Add removed Input classes to the compat plugin

[laoneo]

Summary of Changes

Reverts #42890 and moves the classes to the compat plugin instead of easier transition. It uses the same logic as #44240 without the option.

Testing Instructions

• Enable the compat plugin
• Add the following code to the file /administrator/components/com_content/tmpl/articles/default.php:
  new \Joomla\CMS\Input\Input();
• Open the back end articles list with at least one article.

Actual result BEFORE applying this Pull Request

A Class "Joomla\CMS\Input\Input" not found exception is thrown.

Expected result AFTER applying this Pull Request

The articles list is loaded.

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: Change input chapter to be moved Manual#389

• No documentation changes for manual.joomla.org needed

[Hackwar]

Why do we have to add back in all those classes, when most of it is a pretty much direct copy of the framework classes? Why can't we use the alias method? I mean, if you insist on adding back in old classes, I can understand to add the CLI class, but the rest is basically just duplicated code. I don't see why we need that.

[laoneo]

I leave the decision up to the RM's.

[wilsonge]

For the record this one is tricker. Removing the alias from CMSInput functionally changes behavior and forces extensions to change much more of their code as a result. In this very specific case because of that I’m personally against merging this (for the record in favour of merging the other application one)

[laoneo]

Which alias do you mean? This one? It was added in #43209 after I remove the classes in #42890 and was never in production anyway. So this pr basically restores the 5.x behavior, with the only difference that the classes are moved from libraries to the compat plugin.

[wilsonge]

I do mean that one and even though it's not in production it leads to a much bigger b/c break when the compat plugin is disabled.

[tekvishal]

getting this error The file marked for modification does not exist: plugins/behaviour/compat/src/classmap/classmap.php

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44925.}

[tekvishal]

I have tested this item 🔴 unsuccessfully on 88f0ecd

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44925.}