general no-CAS derivative (part 3)

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Prevent native selection: different approach

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23516 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
GGTAPI

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23517 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Correct preview for perpendicular line

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23518 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
general no-CAS derivative (part 4)

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