Fix user-reportable error may not always be returned when using thread collaboration
Fix redundant queries could occur when viewing a forum when "Thread list: use separate query to fetch collaborative thread user information" option was set
Fix edge cases where permission checks may not restore the collaborator's permissions as expected if they are in a non-valid user state
Improve handling where a collaborator could have permissions removed when the thread starter was banned or had significant permissions revoked, most noticeable with "always collaborate" permission
If installed, recommend Thread reply ban teeth 2.9.3+ to avoid unexpected interactions with banned users and collaboration feature
Fix 'can warn' permission did not function as expected for moderators who where collaborators, most noticeable when the "always collaborate" permission is granted
Fix deleting own posts in a collaborative thread could fail
Fix thread collaboration didn't work for threads started by deleted/guest users
Do not leak a thread exists if collaboration isn't permitted for threads/collaborate route
Rework "Permissions requiring explicit sharing" to always apply to known per-thread aspected permissions, these permissions are not selectable/deselectable from this option
Setup specific addons permission sharing defaults when they are installed, recommend using "reset to defaults" on the "Shared permissions" option
Add "reset to defaults" option for Shared permissions/Permissions requiring explicit sharing
Add warning banner to thread collaboration page for a thread when the thread creator is in a state which could result in unexpected lose of functionality
