Make sure ContourPlot does not end up in infinite loop with JUnit

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25565 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.130.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25566 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3302: avoid infinite loop in PathMoverGeneric (not in the changeStep method)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25567 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for PlaySound test

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25568 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Something happens here concerning #3192. But not working yet.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25570 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3302: better fix for the problem

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25571 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e