This two-line change fixes a crash in the front end that occurred
under the following circumstances:
* A server had more than one announcement,
* A user was displaying the announcements, and
* An announcement was deleted (or unpublished, which amounts to
the same thing.)
As might be expected, the bug was caused by attempting to access a
notification using an index value outside the bounds of the existing
announcements. Specifically, in two places. First,
`_markAnnouncementAsRead` attempts to modify announcements based on
the current index. This is what caused the front end crash. Second,
when rendering the `Announcements` component, the code paginates the
announcements and displays the current one. This did not cause a
crash, but caused the front end to confusingly display a blank
announcement (in situations that would have caused a crash) with no
way for the user to navigate back to previous announcements.
This commit fixes both issues by adding a check to ensure that the
code never attempts to access an announcement with an index greater
than or equal to the number of announcements present.
* Change meaning of /api/v1/announcements/:id/dismiss to mark an announcement as read
* Change how unread announcements are counted in UI
* Add unread marker to announcements and mark announcements as unread as they are displayed
* Fixups
Change `all_day` to be a visual client-side cue only
Publish immediately if `scheduled_at` is in the past
Add `published_at` and `updated_at` to announcements JSON
* Move announcements above scroll container; add button to temporarily hide them
* Remove interface for dismissing announcements
* Display number of unread announcements
* Count unread announcements accurately
* Fix size of announcement box not fitting the currently displayed announcement
* Fix announcement box background color to match button color
* Add announcements
Fix#11006
* Add reactions to announcements
* Add admin UI for announcements
* Add unit tests
* Fix issues
- Add `with_dismissed` param to announcements API
- Fix end date not being formatted when time range is given
- Fix announcement delete causing reactions to send streaming updates
- Fix announcements container growing too wide and mascot too small
- Fix `all_day` being settable when no time range is given
- Change text "Update" to "Announcement"
* Fix scheduler unpublishing announcements before they are due
* Fix filter params not being passed to announcements filter
