Can't select Transform node in 3D View

[ShuffleWire]

Describe the Bug
ditto
Especially bad because I can't move it, to do so I need to select it in the tree.

Steps to Reproduce
Open

#VRML_SIM R2023a utf8

EXTERNPROTO "webots://projects/objects/backgrounds/protos/TexturedBackground.proto"
EXTERNPROTO "webots://projects/objects/backgrounds/protos/TexturedBackgroundLight.proto"
EXTERNPROTO "webots://projects/objects/floors/protos/RectangleArena.proto"

WorldInfo {
}
Viewpoint {
  orientation -0.36630783562978425 0.2247870123314165 0.902933756508936 2.12964342923002
  position 0.9655655585952454 -1.6769303338209047 1.9200352561851333
}
TexturedBackground {
}
TexturedBackgroundLight {
}
RectangleArena {
}
Solid {
  translation -0.24 0 0
  children [
    Shape {
      appearance PBRAppearance {
      }
      geometry Sphere {
        radius 0.1
      }
    }
  ]
}
Transform {
  children [
    Shape {
      appearance PBRAppearance {
      }
      geometry Box {
        size 0.1 0.1 0.1
      }
    }
  ]
}

Click on the sphere, the Solid is selected
Click on the cube, the Transform is not selected
Idem when using a Pose instead of the Transform

Expected behavior
Object should get selected.

System

• Operating System: Webots master@5e8af90ac90158ef640a47ab932f8d7727da7594

Partial solution
Is the bug hiding near void WbView3D::selectNode(const QMouseEvent *event) or void WbSelection::selectPoseFromView3D(WbAbstractPose *p, bool handlesDisabled) ?

in WbSelection:81 in WbSelection::selectNode(WbBaseNode *n, bool handlesDisabled)
I got mSelectedAbstractPose == NULL when clicking on the transform node.

[stefaniapedrazzi]

This is not a bug but a design choice.
Only Solid nodes can be selected from the 3D view.
If you want to move a Transform node using the handles in the 3D view, you have to select it from the scene tree.

The reason of this design choice is to make it easier to select the part of the robots that are commonly defined using Solid nodes.

[ShuffleWire]

I see !

But when the top level of a PROTO is a transform, I can't select it...

[ShuffleWire]

BTW : reading the code I've seen
mSelectedAbstractPose = mSelectedNode ? dynamic_cast<WbAbstractPose *>(mSelectedNode) : NULL;
could it be replaced by
mSelectedAbstractPose = dynamic_cast<WbAbstractPose *>(mSelectedNode); ?
it seems safe according to https://stackoverflow.com/questions/5155820/portably-safe-to-pass-null-zero-to-dynamic-cast
but I'm not a C++ expert !