This is in regard to a problem with the undo feature sometimes losing the first item on the top of the stack when trying to undelete a message that is deleted by hitting the delete key. Recently, I deleted three messages one at a time and then decided that I wanted back the last of the three I deleted. Nothing happened when I did the first undo, subsequent undoes returned the second and third messages deleted but not the last one, the one that I wanted back. This is in 38.7.2 running on OS X 10.11.4 and running with NIS 5 v5.9(35). I have been having an issue with this problem for some time though, not sure when I noticed it though. Certainly it was happening before the most current 38.7.x and 10.11.4.