Create a column chart in 3D.
Activate the chart for editing and click on the chart, so that you get the red
rotation handles.
Pick a corner handle and drag it.
Notice, the chart rotates around the x-axis and the y-axis. You can control,
that it is really only rotated around this axis, if you open the 3D-View.
Expected behavior: The chart rotates only around the z-axis.

In old chartmodul and in 3D-scenes, dragging the corner handles object rotate
around z-axis.
For the simplefied custom shape 3D objects, dragging the corner handles also
rotate around the z-axis.

The behaviour is inconsistent. Solution: Make it work as for other 3D-objects or
show a forbidden icon on the corner handles.



In the middle of the chart, you see a mark for the center of the rotation. When
you come with the mouse over this mark, the mouse pointer changes to a finger.
Seen behaviour: Click and drag on the center does nothing.
Expected behaviour: You can move the center.

Solution: Make the centre mark moveable or don't show it.