Allow to filter pages by mentioned user #2299
Description
Is your feature request related to a problem? Please describe.
Currently it's not possible to search for pages where I have been mentioned. In order to get a quick overview of pages where I got mentioned (e.g. because tasks got assigned to me in meeting notes) it would be helpful to do that.
Unfortunately even full-text search currently doesn't find pages where the username is mentioned.
Describe the solution you'd like
We should allow to search and filter for pages where my user got mentioned.
In the page list filter field, typing @... should offer the possibility to filter by mentioned user and offer my own user first, other members of the collective next.
Describe alternatives you've considered
We probably need support for searching by mentioned user in the full text search implementation. So this should probably be a follow-up of #2118.