No show/hide callback to nested scene item

Operating System Info

Other

Other OS

Fedora release 34

OBS Studio Version

Git

OBS Studio Version (Other)

27.1.3-145-g676ffce4a

OBS Studio Log URL

https://obsproject.com/logs/nr7cKaErojzDajw1

OBS Studio Crash Log URL

No response

Expected Behavior

Source should receive show and hide callback when the source becomes visible and invisible on preview.

Current Behavior

Source in a nested scene does not get show and hide callback when the source becomes visible or invisible on preview by user toggling visibility of the nested scene.

Steps to Reproduce

1. Set studio mode
2. Create scenes as below
   • Scene
   • Scene 1
     • Source
   • Scene 2
     • Scene 1
3. Send Scene to the program
   Send Scene 2 to the preview
4. Toggle visibility of Scene 1 listed as the scene-item of the Scene 2

Anything else we should know?

This bug was originally reported by a user using groups in https://github.com/norihiro/obs-command-source/issues/19.

Start by reproducing the nested-scene visibility steps described in the issue and trace how scene-item visibility changes reach nested sources. Done means a source inside the nested scene receives show and hide callbacks when its containing scene item is toggled in the preview.