#3631 continued, token acknowledged

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29090 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3621: corrected the newer problem (single EV was not set visible)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29094 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix(?) for #1376 (slider with dependant endpoints should disappear when endpoints equal):
r2841 again - I reverted this because of Unit test errors. I'd like to see, if Unit test will be ok now, or not.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29095 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e