XF2 Addon [vbresults.com] Thread Merge

Description Releases Discussion

Summary
The built-in thread merge has 5 problems when you merge 'Thread B' into 'Thread A'; this add-on fixes those problems.

'Thread B' will only redirect to the first page of 'Thread A'. If 'Thread A' already had a full page of posts, old links will go to a page without the expected content.

This can lead to compounding problems with Google SERPs because the first post of the new thread no longer has the content that was expected and is deindexed.
If 2 or more users are already watching 'Thread B', then merging into 'Thread A' deletes their subscriptions which destroys user engagement.

In a way, merging is literally a 'delete engagement' button.
There is no way for people replying to 'Thread B' previously to know a merge occurred unless a moderator makes a boilerplate reply saying the thread was merged.

This is an extra step for the moderator to take.
The merged thread leaves a redirect entry taking up the space of a real one that has content, and the only way to avoid that is to not redirect.
If 1 or more users are reply banned from 'Thread B', then merging into 'Thread A' deletes those reply bans and can let trolls invade the target thread.

If post #1 of 'Thread B' is merged into page 3 of 'Thread A', the redirect always goes there instead
Watch subscriptions are transferred over to the new thread to retain engagement
A notice now indicates when a merge has taken place (screenshot below)
Merged thread redirect entries are now hidden from the thread list
Reply bans are now merged

Other features

Destination thread view count on inline moderation tool (1.0.2+, screenshot below)

Under Admin > Add-ons > Install/upgrade from archive, import/install the attached add-on zip

User view:

Admin view:

Note: For merges that were previously done without this add-on, the Google deindexing is irreversible.

XF2 Addons [vbresults.com] Thread Merge 1.0.8
Add-on that fixes the built-in thread merge