Add down key check has tribute container (#21016)
Add down key check has tribute container (#21016)

Fixes an issue where users would not be able to select by pressing the down arrow when using @TAG above a message

Bug videos:

https://user-images.githubusercontent.com/1255041/188095999-c4ccde18-e53b-4251-8a14-d90c4042d768.mp4

go-gitea/gitea,go-gitea/gitea,go-gitea/gitea