(graphics): fix tuto04SignalSlot displaying
The following discussion from !495 (merged) should be addressed:
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@ctrompf started a discussion: (+7 comments) The behaviour of tuto04SignalSlot is not the same as before:
- The mesh is not displayed in the main view anymore.
- When moving the mesh in one of the two side views, it does not move in all the views (I don't know if it was intended).