Filters used to be applied only at the display stage.
There is remaining work here:
- Hide filters still will not hide until we update Filter to use API V2.
- Filter work is now duplicated and should be made more efficient.
- It may be important to hold on to statuses even if they are hidden, so that they can be shown if the filter changes.
Contributes to #1354 [BUG] Mastodon iOS App Ignores "Hide completely" Filter action Setting
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