[v3][svg] \overleftrightarrow{abc} in Mathjax 3

Created by: jano-m

It produces extra horizontal bar between <-> and abc, and prints two errors to console:

tex-svg.js:formatted:14429 Error: <svg> attribute width: A negative value is not valid. ("-409")
tex-svg.js:formatted:14429 Error: <svg> attribute viewBox: A negative value is not valid. ("-102.3 -182 -409 865")

Remarks: it works fine if the number of chars is less or more than 3 (or perhaps it depends on the total width of those chars)