### Steps to reproduce

* Set up a date reminder in the future on a work package

* Don't mark that work package notification line as read

* Wait till the reminder is triggered


### What is the buggy behavior?

* Two (or more) lines can now generated in Notification center for same work package: one for regular notifications, the other for the reminder

* Clicking on one selects all other lines associated with the same WP


### What is the expected behavior?

* Begin of the insertionAggregate the Reminder notifications with other notifications (regular aggregation) so that only one item per work package is visible in the notification center.

* Reminders given the highest priority (if set), so that if there are also other notifications later (like a mention or a change of assignee), any attached note is still visible in the list

* In the unique case where there is both a date alert and a reminder, the last line will include the date alert and the reminder note

* Date alerts are also given a higher priority than mentions

* This avoids the inconsistency that would otherwise result when there's a mention + date alert + reminder (without a note), where the date alert takes precedence over the mention. This behaviour would be logical, since the date alert is more time-sensitive than a mention (and easily discovered in the activity tab).


<br>

* ~~ClickingEnd of the insertion Begin of the deletion ClickingEnd of the deletion on a notification in the work package only selects that one, not Begin of the insertionthe~~ _~~other~~_ ~~lineEnd of the insertion Begin of the deletion the _other_ lineEnd of the deletion even if it&#39;s the same work Begin of the insertionpackage~~End of the insertion Begin of the deletion packageEnd of the deletion

* Begin of the insertion~~TheEnd of the insertion Begin of the deletion TheEnd of the deletion user action (of a single click) is Begin of the insertionrespected.~~End of the insertion Begin of the deletion respected.End of the deletion

* Begin of the insertion~~IfEnd of the insertion Begin of the deletion IfEnd of the deletion a user acceses the notification from the notification center and there are multiple work packages Begin of the insertiondisplayed.~~End of the insertion Begin of the deletion displayed.End of the deletion

* Begin of the insertion~~Ideally,End of the insertion Begin of the deletion Ideally,End of the deletion the one they clicked will be Begin of the insertionselected.~~End of the insertion Begin of the deletion selected.End of the deletion

* Begin of the insertion~~IfEnd of the insertion Begin of the deletion IfEnd of the deletion not possible, the first work package in the list will be Begin of the insertionselected.~~End of the insertion Begin of the deletion selected.End of the deletion

* ~~The work package is only displayed once, with the most relevant update~~

* ~~If a reminder exists, the reminder is the most relevant update~~

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### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/259327/content">

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### Environment information

**Community**
OpenProject 15.1

**Browser:**
Firefox, Mac (desktop)

**Language**
EN