Fix for #4010, #2578 and maybe for #3768.
(And: highlighting move to the first tool automatically in CAS (e.g.), where I click on a tool (e.g. on Factor tool). - this works like this on desktop too.)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31323 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e