This feature can be enabled by choosing a destination for the
`shared drafts category` site setting.
* Staff members can create shared drafts, choosing a destination
category for the topic when it is published.
* Shared Drafts can be viewed in their category, or above the
topic list for the destination category where it will end up.
* When the shared draft is ready, it can be published to the
appropriate category by clicking a button on the topic view.
* When published, Drafts change their timestamps to the current
time, and any edits to the original post are removed.
timezone offset was calculated and sent from browser to server, it would be applied on utc time generated from '2013-11-22 5:00' format for example and then sent back to browser which would display it thinking it's UTC time using `moment(utc time)` when it's in fact an UTC time we have offseted with the initial user timezone.
This is impossible to automatically test in the current app state. Easiest reproduction is in live browser after setting your timezone to `America/New_York`, when setting a topic timer to later_today, after save, the time under the topic should be off to something roughly equal +1/-1 hour to your timezone offset.
Remove security by obscurity feature that tries for exact slug match
If you need to hide a topic from users either move to a secure category
or convert to a PM
Figuring out what unread topics a user has is a very expensive
operation over time.
Users can easily accumulate 10s of thousands of tracking state rows
(1 for every topic they ever visit)
When figuring out what a user has that is unread we need to join
the tracking state records to the topic table. This can very quickly
lead to cases where you need to scan through the entire topic table.
This commit optimises it so we always keep track of the "first" date
a user has unread topics. Then we can easily filter out all earlier
topics from the join.
We use pg functions, instead of nested queries here to assist the
planner.
