Right click menu's subpopup position improvement. (#2977)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27527 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
debug messages removed (#2977)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27528 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e