updateCascadeLocation() update dependent algorithm only if this algorithm is not currently updated by updateCascade(): comment

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22923 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
updateCascadeLocation() update dependent algorithm only if this algorithm is not currently updated by updateCascade(): optimization

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22924 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
IntersectPath[ <Line>, <Polygon> ]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22925 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
New button icon for view from plane style bar (orientation)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22926 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NullPointer fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22927 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e