Insade 2D - 3D transition [release backport]
When going from 2D view to 3D view on a 2D poly data (on the Mandelbrot source for instance), when switching back to 3D, the object is very very far, and the user needs to zoom in. The camera's z coordinate was being set to 10000. This commit sets it to 6.69, which is the same default value as in views_and_representations.xml.
Backport of !5759 (merged)