Add a special ckeditor plugin libraries directory to the search list for the js plugin.

Hi @rahul.shinde, thank you for your input. But, if we would change the path to a hardcoded path like yours, many other installations would fail to recognise their Indentblock plugin after update.

For Drupal 9 there is a recommended way to find the plugin, but up to now there is no official recommendation to move the indentblock library to a subfolder of libraries. As the ckeditor maintainers have not reviewed the documentation page, you refer to, it cannot be considered official.

In another issue #3058017: Drupal 9 Deprecated Code Report, we changed the method of finding the plugin to the Drupal 8.9 / 9 recommended method.

Reopening this issue as with the new version of the installer, we have a possibility for searching at more than one path for the Indentblock library and can add the path of the ckeditor documentation without breaking existing installations of the module.

During installation and runtime the ckeditor_indentblock module is searching for the Indentblock plugin at following places in that order:

1. At the path of the current multisite: sites/domain.tld/libraries/indentblock/plugin.js
2. At the drupal root path: libraries/indentblock/plugin.js
3. At the path for ckeditor plugin libraries: libraries/ckeditor/plugins/indentblock/plugin.js
4. At the path of the current profile: profiles/profile-name/libraries/ckeditor/plugins/indentblock/plugin.js

See attached patch.

Fixed.

Remove assignment.