* Fixes: NB#113282 - Viewer: "Priority" field is added in message header area after removing an attachment.
* Fixes: NB#113634 - Viewer view: progress indication should be shown if opening a proper viewer for an attachment takes longer time
* Fixes: NB#113282 - Viewer: "Priority" field is added in message header area after removing an attachment.
* Fixes: NB#113634 - Viewer view: progress indication should be shown if opening a proper viewer for an attachment takes longer time