Fix for show / hide input dialog

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36921 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4633 extrude refactoring

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36922 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix for #4634

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36923 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4633 NPE fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36924 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e