On Sun, 27 Mar 2016 22:51:56 +0200 martin rudalics wrote: >> Let's start with a much simpler reproducer: >> >> . emacs -Q >> . Type "C-x" and wait until you see "C-x-" in the echo area >> . Type "5 2" >> >> Result: a new frame is displayed, with both frames showing the >> "C-x 5 2" echo, which already sounds like a bug (only one frame should >> show it). >> >> Now type "C-p" -- only one of the two echo messages will disappear, >> the one in the non-selected window stays put. >> >> This didn't happen in Emacs 24.5, where the "C-x 5 2" echo is first >> cleared, and then redisplayed after the new frame is created. > > So far it's just queer but after returning to the first frame and typing > C-p there repeatedly, "C-x 5 2" remains fixed in that frame's echo area. > >> According to my testing, this problem appeared between Aug 31 and Sep >> 30 last year. > > I love bisecting. Especially when copyright lines change. > > My recipe can be obviously simplified as well: > > . emacs -Q to get the first frame > . Type C-x 5 2 to get the second frame > . Evaluate (message "x\ny") in the first frame > . Type C-p in the second frame I inadvertantly executed Eli's recipe yesterday and noticed an additional oddity, seen in this screenshot (I didn't realize that that recipe triggered it and since I couldn't otherwise reproduce the oddity and had never seen it before, I didn't feel I had enough information to file a bug):