Add TeX error as data-mjx-error, similar to compile/typeset errors #490
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This PR adds a
data-mjx-error
attribute (like the one for compile/typeset errors and like theno errors
extension) that contains the error message. This makes the error message consistently available via thedata-mjx-error
attribute of themerror
element, for easier error processing later. (E.g., the contextual menu could use this to report the error.)