Viewport nodes give no user feedback explaining that they can't be ungrouped.

[georgegeiwitzcesana]

Godot version

3.3.2

System information

Windows 10 , GLES 3

Issue description

Viewport nodes cannot be ungrouped. This in itself is not a bug. What is a bug is that the user can try to ungroup a Viewport, and Godot gives no feedback saying this is intentionally impossible, which makes it seem like a bug.

Steps to reproduce

Create a new project.

Create a Viewport node as a child of the main scene.

Give the Viewport some children.

(The ungroup button does not appear disabled.)

Click the "ungroup" button.

The ungroup button appears to have been clicked successfully, except that its image does not change. Even more confusingly, a message appears in the output saying that the Viewport was ungrouped.

Minimal reproduction project

No response