AdminUI: Use Select2.js for SiteSetting Lists – adds Autocomplete and DnD-Sorting #2405
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This PR rebases the list-sitesetting component on top of Select2.js for better autocompletion and sorting support. For the later it uses the already included html5sorting library. Additionally sitesettings can now also contain a choices-list that is shown as autocomplete (preventing typos) and are automatically merged if extended by plugins. This has been added for post_menu, top_menu and share_links.
To extend this, a plugin just provides a site_settings.yml file with the following:
Some screenshots:
Autocomplete:
Drag and Drop with placeholder element for positioning: