On Sun, Mar 16, 2025 at 2:05 AM Aaron Jensen wrote: > On Sat, Mar 15, 2025 at 9:43 PM, Gerd Möllmann > wrote: > >> Aaron Jensen writes: >> >> Adding Gerd Möllmann. >> >> The flicker appears to have been introduced by the work done in >> 414de92a562 >> >> Initial child frames based on master (Mon Oct 21 18:32:04 2024 +0200, 5 >> months ago) >> >> It's a fairly large change set, so I don't know yet what might be causing >> it. I can reproduce it fairly consistently using my own setup, but I don't >> know how to narrow it down to something from Emacs -Q because it appears to >> be related to CPU utilization and/or rapid updating of buffers that are not >> currently visible. >> >> Aaron >> >> On Sat, Mar 15, 2025 at 9:49 AM, Aaron Jensen >> wrote: >> >> Here's a video clip: https://share.cleanshot.com/x8zWLgYf >> >> It seems to happen more often when there is significant load. In this >> case, I was running an 8 worker web server in a vterm in Emacs and a set of >> 8 parallel UI tests against it. The server was printing log messages at a >> rapid rate, but that vterm buffer was not visible. >> >> Aaron >> >> I'm afraid I have not the slightest idea. >> >> 414de92a562 concerns only ttys, AFAICT. I've looked through the commit >> again right now. The changes to NS code directly are only trivial ones >> (1 -> true, 0 -> false etc.). So it would have to be something in >> redisplay_internal or something similar, in code not specific to NS that is >> used on all window systems, and I don't see a change there that could cause >> something with the symptoms you describe. >> >> Adding Alan Third in CC. Maybe he has an idea. >> > > I'll try and eliminate aspects of the patch as best as I can. If this is, > in fact, a macOS only issue, then it may be that the particular method of > drawing the windows in macOS is susceptible to some change that was made > here. No idea what it could be, either. I do see that the NS-specific > changes appear to be innocuous. > What is your frame-parameter inhibit-double-buffering set to? Have you tried flip-flopping it to see if that has an impact?