macOS: "Postponed" printing on secondary displays w/ "Displays have separate Spaces" turned **Off**

[nihil2501]

Observed defect

Typing in the terminal won't immediately print the typed characters in the terminal. When cmd+tab'ing to another application window, I then see what I typed print in the terminal. This is what I mean by "postponed". Printing isn't "postponed" 100% of the time, but it is very frequent: ~50%.

Repro video

macOS screen recording somehow prevents the defect from occurring which is why I made a phone recording. Here I spam my keyboard, nothing prints, click inside terminal, and everything I spammed prints out at once.

PXL_20250216_004538003.mp4

Scenarios tested

I tried this with both macOS settings for "Displays have separate Spaces", and with having the terminal visible on the primary display and secondary display. Defect observed (:bug:) in only one out of these four scenarios:

| Displays have separate Spaces | Primary Display | Secondary Display |
|-------------------------------|-----------------|-------------------|
| **On**                        |                 |                   |
| **Off**                       |                 | :bug:             |

Prior Discord discussion

https://discord.com/channels/1005603569187160125/1340465646516834364

System info

OS: macOS Sonoma 14.6 arm64
Host: MacBook Pro (16-inch, Nov 2023, Three Thunderbolt 4 ports)
Kernel: Darwin 23.6.0
Uptime: 31 days, 7 hours, 31 mins
Packages: 83 (brew), 13 (brew-cask)
Shell: fish 3.7.1
Display (Color LCD): 3456x2234 @ 120 Hz (as 1728x1117) in 16" [Built-in] *
Display (LG Ultra HD): 3840x2160 @ 60 Hz (as 1920x1080) in 27" [External]
Display (LG Ultra HD): 3840x2160 @ 60 Hz (as 1920x1080) in 27" [External]
DE: Aqua
WM: Quartz Compositor 175.400
WM Theme: Multicolor (Dark)
Font: .AppleSystemUIFont [System], Helvetica [User]
Cursor: Fill - Black, Outline - White (32px)
Terminal: ghostty 1.1.2
Terminal Font: JetBrains Mono NL (13pt)
CPU: Apple M3 Pro (12) @ 4.06 GHz
GPU: Apple M3 Pro (18) @ 1.38 GHz [Integrated]
Memory: 13.16 GiB / 18.00 GiB (73%)
Swap: 130.38 MiB / 1.00 GiB (13%)
Disk (/): 114.84 GiB / 460.43 GiB (25%) - apfs [Read-only]
Local IP (en0): 192.168.0.19/24
Battery (bq40z651): 100% [AC connected]
Power Adapter: 30W USB-C Power Adapter
Locale: en_US.UTF-8