Redmine

I could reproduce this on the current trunk:
when an issue is created with an assignee who has "Issues assigned to me" enabled, the assignee is not added as a watcher. The assignee is only added on the next update of the issue, and only if still assigned. If the first update reassigns the issue, the original assignee is never added and gets no more notifications after the reassignment.

The patch applies cleanly to the trunk, its tests pass, and the assignee is added on creation in both cases.

One remark: all automatic watchers (Issue#add_auto_watcher and Journal#add_watcher, since #4347, #38238 and #2716) require that the user who is added has the permission "Add watchers", while the "Watch" link only requires that the user can see the issue. So a user without this permission can watch an issue by clicking "Watch", but the "Automatically add me as watcher" options do nothing for them.

The patch does not check this permission, which I think is right, but it now differs from the other options. Removing the "Add watchers" check from all automatic watchers, and only checking that the user is active and can see the issue, could be done in a separate issue.