Bootstrap 5: dropdown is too complicated (outdated)

Grimreaper → closed merge request !49

I opened the new MR https://git.drupalcode.org/project/ui_suite_bootstrap/-/merge_requests/50, because previous one needed a rebase and to make the rebase easier I squashed the commits so to not lose the history, I pushed this squashed and rebased version on a new branch, so new MR.

As discussed, MR 50 had not been tested on real usage with menus, and modules like https://www.drupal.org/project/menu_link_attributes → to allow to add classes/attributes on the link and/or on the wrapper.

Also, the nav pattern had been forgotten in the refactoring.

I tried to make it work, but it is too time consuming and I have side effects on side effects.

The main problems:
- in real menu links, "url" is a URL object which options contains the attributes that will be used on the a tag.
- also the route of the URL object can determine extra behavior like that will display a span and that will display a button.
- in real menu links, attributes is then for the link wrapper.
- not using the link() method bypass attributes put on the link. And do not use the link generator system of Drupal that can be altered.
- so I don't think the patterns should be done based on a structure easily manipulable in YAML preview structure but based on a "real" structure.

I know there is the subject of removing PHP preprocess from themes, but I think here it is needed.

When updating ✨ Bootstrap 5 : Components > Toasts Fixed MR, I found out that |default('true') or |default(true) was bad for ensuring boolean settings default value. Ok for false, but as false or null is evaluated the same way having |default(true) force the setting value to true even when FALSE.

The only pattern having that is the dropdown in: {% set auto_close = auto_close|default('true') %}

pdureau → closed merge request !113

We move here 📌 Bootstrap 5: Convert menu, breadcrumb and pagers to the links prop type Needs review

Grimreaper → closed merge request !50