The current preview generation is more confusing than useful.
Therefore it is better to disable it until better preview generation
methods are found.
Differential Revision: https://developer.blender.org/D13728
Do not temporarily change U.pixelsize while creating object previews
in object_preview_render. It does nothing to the render, but the change
in line width can affect other UI drawing since it is done in a thread.
see D13717 for for details.
Differential Revision: https://developer.blender.org/D13717
Reviewed by Julian Eisel
