Matrix braces is not supported in MathML: In conversion to MathML, unknown type : mopen

[alexprey]

Description

Usage of braces from virtual keyboard leads to errors of MathML converter, that says that mopen or mclose entries is not supported. But if I use physical keyboard with [ the output is correct

Steps to Reproduce

1. Use math-field element with MathML output
2. Place matrix braces from virtual keyboard

Actual Behavior

Output is not genereted correctly, debug information in console:

In conversion to MathML, unknown type : mopen

Expected Behavior

Correct MathML are generated w/o any errrors.
Matrix specification: https://www.w3.org/TR/MathML3/chapter3.html#presm.mtable

Environment

Operating System Windows
Browser Opera

[arnog]

Fixed now.