[FIX] mail: User following task can't add another follower
[FIX] mail: User following task can't add another follower

Issue

	- Login as Mitchell Admin
	- In Projects module, Create a new project
	- Set Visibility to 'Invited employees'
	- Create new task and assign it to Mitchell Admin
	- Edit the task and add Marc Demo as follower
	- Login as Marc Demo
	- Go to the task previously created
	- Add an other follower

	IrRule Error

Solution

	Use sudo() to find all followers of a document.

opw-2303443

closes odoo/odoo#55516

X-original-commit: e0d064ffe4013ed727bdc780a3d0a7c6b16e6e9c
Signed-off-by: Simon Goffin (sig) <b3ed2cf313e7546085c3c50622143ff31e467d23@openerp.com>
Signed-off-by: bon-odoo <e19836c0ea27a135a9ddccf8b92fac375fd6f048@users.noreply.github.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo