Fix for #3035

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23982 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed EPSILON_SQRT (was never updated anyway) -- #3089

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23983 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Draw the background of the formulas only if that's different from the background of the graphics view (both in MathQuill and CanvasMath)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23984 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e