Multi Prefix 2.15.4

• Fix XF2.3 compatibility with "Move thread prefixes location:Sub-title" style property and using em/rem font-sizes

• DB Tech shop v7.0.0+ support
• Fix DB Tech eCommerce v4.1.0+ prefix filtering support

• For XF2.3+, Fix "Move thread prefixes location" style property would fail to apply due to a bad template modification

• Remove leftover select2 css
• Recommend Standard Library by Xon v1.21.9+ due to prefixes may disappear when using the "move thread" dialog.

• Recommend StandardLib v1.21.5+
• Move multi-prefix style properties to "Multi Prefix" group
• Add "Close dropdown on select" style property (default: true).
  This feature requires StandardLib v1.21.5+

• Require StandardLib v1.21.0+
• XF2.3 support
  • Replaces select2 library with a customized choices.js build from StandardLib
• php 8.4+ compatibility fixes
• Fix multi-prefix-content-parent="XF:Thread" being rendered as part of new thread HTML
• Fixes for XenConcept's Project Manager
  • Fix api support for projects
  • Fix cleaning up prefix data when a prefix is deleted for XenConcept's Project Manager
  • Fix internal server error when touching non-functional drafts action for project items
• Improve compatibility with Mod Tools Improvements
• Compatibility with DragonByte eCommerce v4.0.0+
• Compatibility with DragonByte Shop v7.0.0+

• Fix threads could fail to be re-indexed when changing the prefix list
  • This update does not trigger a search index rebuild
• Improve Prefix Essentials compatibility (not yet fully compatible)

• Add support for ModToolsImprovement's "copy threads" inline moderation action

• Fix selecting (No prefix) by default in the forum filter dropdown

• Fix javascript error (Cannot read properties of null (reading 'length')) when editing the first post of a thread