Collaborative Threads 2.12.0

• Fix preview when 'always collaborate' is enabled when posting new threads
• Fix cases where the "Allow edits from collaborators" checkbox didn't show despite collaboration allowing editing of that post
• If a thread has collaborators, allow a thread starter who does not have permission to start a collaborative thread to mark their posts as editable by collaborators.

• Threadmark v2.6.0+ support
• Fix preview when 'always collaborate' is enabled when posting new threads

• Add dedicated push templates (rather than re-use alert templates)
• Properly respect the Add/remove collaborators alert options

• Fix php 7.4+ warning about Threadmark's canViewRecentThreadmarksList not matching expected argument lists

• Fix moderator log not recording added/removed usernames

MariaDB MDEV-21377 (exact ticket may vary) has known performance issues. This can me migrated by setting optimizer_use_condition_selectivity=1 in the server's config

If poor performance with occurs with MySQL 8+ (or MariaDB without the above configuration change), please use Optimized List Queries v2.3.0 with the "Better Thread List Page Threshold" option set to 0.

This will inject a work-around which should migrate the poor query performance until this add-on can be restructured to avoid that query

• Fix adding attachments to existing posts when user is a collaborator for the thread but not the thread starter

• Improve User Essentials support for 'thread starter permissions' (recommend v3.4.2+)

• Require XenForo 2.1+
• Update README.md with post-install configuration instructions
• Add options icon
• Add option to disable 'thread starter alerts' integration for "always collaborate" permission
• Add collaborative post edit option during replies (more options) and on new threads
• Allow viewing of the per-post "Allow edits from collaborators" option for existing collaborative posts when the thread starter can no longer manage collaborative threads
• Allow setting per-post "Allow edits from collaborators" option before thread collaborators are added

• Fix error deleting ad-hoc per-thread groups that still has members