IINA+ sometimes can't detect my monitor supports HDR

[kailiu42]

System and IINA version:

• macOS 12.6
• IINA 1.3.0 Build 131, CI build from cbdde216a43b67f49e19a6f5ab5071ef50113911

Expected behavior: HDR switch on the video setup panel is on every time when playing on HDR monitor.

Actual behavior: I have an LG 27UP600 monitor which supports HDR, the macOS monitor configuration screen shows a "High Dynamic Range" checkbox and is checked by default. However, I noticed that sometimes IINA+ thinks my monitor supports HDR and allows me to turn on HDR on the video setup panel, but sometimes that switch is greyed out as if it thinks my monitor doesn't support HDR.

When that switch is greyed out, I have to go to macOS monitor configuration, uncheck and check again the HDR checkbox, then reopen IINA+, then the switch is no longer grey and HDR is turned on.

How often does this happen? This seems to happen each time after my monitor power is turned off then on, or after the DP cable is unplugged then plugged back. The monitor shows a HDR notification each time it powers on if the macOS HDR option is on, and it indeed shows it after powered on so it seems the OS is correctly recognizing the monitor as HDR and configured it as HDR. But IINA+ is not as described above.