Daniel Stone authored Aug 10, 2016 and Ana Rute Mendes committed Jun 22, 2020

If a transaction has an object that a particular user cannot see, then
mark the transaction as hidden for the default transaction view. This
particularly elides 'foo moved this task from Restricted Workboard
Column to Restricted Workboard Column on the Restricted Project board'
messages in the timeline, which are not hugely useful.

This would need a fair bit more work to go upstream, especially eliding
notifications for restricted-only transactions as well.