Fixed
- Fixed Browser check (#5331)
- Improved joining customer messages into conversations on Fetching (#5308)
- Do not allow to move emails from customers from inaccessible mailboxes (Security)
- Check if customer is accessible when changing conversation customer (Security)
- Check customer visibility when creating a customer within Change Customer dialog (Security)
- Check customer visibility when creating Phone conversation (Security)
- Check thread
created_by_user_idwhen Undoing sending (Security)