Fix crash when previewing a scene with a mesh as the root node #87781
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This PR fixes a crash that happens during an edge case where the imported scene's root node is a mesh. The code replaces each ImporterMeshInstance3D node with a MeshInstance3D, but in the case of the scene root, the reference to the scene was being left as a dangling pointer. Now it sets the scene to the new root node. Also I added a comment.
I have used
unlikely
here because this check will only be true at most once for each file and usually 0 times.Test file: crashlight.glb.zip
In master: crash
With this PR: