There is also task T66461: Sequencer: Scene strips cameras from all scenes can be selected
I am not quite sure how to solve that. It would be nice to filter in context of some arbitrary data (or list of data) provided by argument, so I could filter all cameras of provided scene. I guess I could implement that, but I would like to hear feedback.

We should be able to use the pointer poll function here.

See: rna_Curve_otherObject_poll for example.

This way it doesn't rely on the layout code to enforce this rule.

Correction PROP_ID_SELF_CHECK is a better choice in this case.

This revision now requires changes to proceed.Oct 14 2019, 9:54 AM

Revert "Fix T69636: Crash when rendering scene srtip."
Use poll function to filter scenes

Harbormaster completed remote builds in B5362: Diff 19011.Oct 15 2019, 4:58 AM

@Campbell Barton (campbellbarton) I am not sure if T69636: Crash when rendering in VSE is even valid then, because you can choose camera "from another scene" even in properties editor as source for rendering.
I guess I could look up available camera in collection? But not sure if collection is filled by depsgraph or why it isn't available during handling RNA.

Richard Antalik (ISS) mentioned this in D6073: Fix (unreported) VSE scene strip should not be able to set the scene to self.Oct 16 2019, 2:01 AM

Abandon in favor of D6073