[web] bugfix: infinite loop drawing near-horizontal dashed lines

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24218 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3120: sqrt can be entered without backslash with MathQuill

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24219 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
bugfix: vector * (matrix * vector) needs brackets

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24220 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e