#4025 fixed in desktop

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31364 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Check region transparency

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31365 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove also polygons after a region (conic, etc.) is found in hits

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31366 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3895 storing colors in  int to convert it easily to GColor

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31367 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e