Ticket #4810: still not managed to find the perfect CSS solution for permanent border around MathQuillGGB editing box (mathquillggb-rendered-math, mathquillggb-editable do not work), but at least here is some progress

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38169 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4810: maybe this solution is still not perfect, but maybe Okay for now (the outermost single element used to be e.g. "roman font", that should not get border for hasCursor)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38170 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e