* deadcode: remove UpdateChannelLastViewedAt * deadcode: remove ThreadStore.(Save(Multiple)|Update|Delete) * deadcode: followThead in App.MarkChannelAsUnreadFromPost * document ThreadMembership, Thread structs * maintain LastUpdated consistently Whenever we touch a `ThreadMembership` record, we should be setting `LastUpdated` to the current timestamp. The mobile client relies on this to detect changes to these records. * simplify: never updateThreads from `App.MarkChannelAsUnreadFromPost` Change all invocations of `ChannelStore.UpdateLastViewedAtPost` from `App.MarkChannelAsUnreadFromPost` to pass `updateThreads` as `false`. When `ChannelStore.UpdateLastViewedAtPost` was invoked with `updateThreads` as `true`, it would in turn call `ThreadStore.UpdateUnreadsByChannel` but pass `updateViewedTimestamp` as `false`. This effectively updated the `LastUpdated` field of the corresponding thread memberships but never touched any of the actual data (such as `LastViewed`). The overall CRT feature continued to work, because `App.MarkChannelAsUnreadFromPost` directly updates the relevant thread memberships via `ThreadStore.MaintainMembership`. * deadcode: updateThreads in ChannelStore.UpdateLastViewedAtPost * simplify: never updateThreads from App.SendNotifications Change all invocations of `ChannelStore.IncrementMentionCount` from `App.SendNotifications` to pass `updateThreads` as `false`. When `ChannelStore.IncrementMentionCount` was invoked with `updateThreads` as `true`, it would in turn call `ThreadStore.UpdateUnreadsByChannel` but pass `updateViewedTimestamp` as `false`. This effectively updated the `LastUpdated` field of the corresponding thread memberships but never touched any of the actual data (such as `UnreadMentions`). The overall CRT feature continued to work, because `App.SendNotifications` directly updates the relevant thread memberships mention counts via `ThreadStore.MaintainMembership`. * deadcode: updateThreads in ChannelStore.IncrementMentionCount * fix & rename ThreadStore.UpdateUnreadsByChannel Rename `ThreadStore.UpdateUnreadsByChannel` to `ThreadStore.UpdateLastViewedByThreadIds`, making it unconditionally set the `LastViewed` for the given threads (as well as `LastUpdated`). All previous invocations of this method that passed `updateViewedTimestamp` have been previously removed. * unrelated gofmt -w -s changes to satisfy linter * always set LastUpdated to model.GetMillis() * deadcode: ThreadStore.SaveMembership * fix TestMarkUnreadWithThreads * GetMasterX
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