Try to fix black flickering

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27387 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3503 every DOM touch cached.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27388 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e