System and IINA version:

• macOS 13.1
• IINA 131 build 133.
  • Also confirmed in HEAD of develop 2199267
  • Also confirmed with fix Fix black window switching from music to video, #4055 #4249 applied. Same problem, and with an additional issue: in step 3 below the video window flickers (seems to hide) momentarily when switching into PiP

Steps to reproduce:

1. Enable UI > Picture-in-Picture > Toggle Picture-in-Picture by minimizing/un-minimizing the window. The other PiP settings don't seem to make a difference.
2. Open a video and start playing. Pause.
3. Enter Picture-in-Picture.
4. Wait a second to make sure it's settled.
5. Click the Toggle PiP button inside the PiP window to toggle out of PiP.

Expected behavior:

Assuming Accessibility > Reduce motion is disabled in System Settings, smooth scaling animation into and out of PiP, displaying the content of the video with no breaks.

Actual behavior:

There is some flickering when coming out of PiP and the main window is displayed a bit too early, and when animation is done, the main video window is black (specifically, the VideoView appears to be hidden).

Bonus issue: Reduce motion does not appear to be honored when enabled.

• MPV does not have this problem.

How often does this happen?

Always