Open Radar

 
Summary:
Mail 9.0: Modal UI delay on accepting Exchange invitations

Summary:
If you accept an Exchange Calendar invitation on El Capitan GM (15A282b) in Mail, the UI “stalls” for a second or two (or multiple) before returning to normal operation.  The stall is modal; the Mail UI does not accept or respond to inputs during that period.

This UI stall is an El Capitan regression from prior releases.  There is no corresponding UI stall in Yosemite and prior.

Steps to Reproduce:
1] Mail configured with an Exchange account. (In my testing and reproduction, the mailbox is on Office 365.)
2] Receive a meeting invitation from another Exchange user.
3] Accept or Decline that invitation within Mail, using the action buttons at the top of the message display.

Expected Results:
The invitation message should immediately vanish from view, the event changes should be written to the mailbox, and the invitation removed from the Inbox.

Actual Results:
The UI "freezes" for a second or two (or more).  No UI interaction is possible in Mail during this period. After this variable period of a "stall", the UI returns and normal operation resumes: the invitation vanishes from view, the message disappears from the Inbox.


Version:
Mail with Exchange account (personal testing is with Office 365)
Mail 9.0 (3094) with El Capitan GM (15A282b)
First noticed in DP6 (15A244d).