MaterialPreview refinements finished

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23687 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Rubrik4 sorted output.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23688 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
sort fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23689 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e