Add all macros currently supported by MediaWiki

[physikerwelt]

Add all macros definitions that are currently available on
Wikipedia and related projects. Those additional
symbols were introduced in

wikimedia@ff2accb

cf. https://phabricator.wikimedia.org/T105310

[physikerwelt]

@pkra I had a look at the new mathjax-node version. It looks quite promising. However, I discoverd a small difference between the wmf version and the latest MathJax version. Thus I'm creating this pull request to end up with a version of mathjax that can be used to run the mathpipe test and thereafter be the basis for a new mathoid version.

[pkra]

Thanks! Have you looked at #566 (comment)? That would get you better quality across math styles (in the TeX sense).

[physikerwelt]

@pkra yes that might be better. But I think for this change it's best to handle all unicode chars in the same way. Up to now, I'm not aware of any complaints about the spacing of those commands.
An other question: How would that interfere with https://phabricator.wikimedia.org/T143520?

[pkra]

Up to now, I'm not aware of any complaints about the spacing of those commands.

Using mathchoice would primarily improve the sizing in display-style (increasing it).

An other question: How would that interfere with https://phabricator.wikimedia.org/T143520?

It's unrelated.

[physikerwelt]

ok. I created a ticket for the size improvements
https://phabricator.wikimedia.org/T161009

[pkra]

@physikerwelt ping.

We're wrapping up v2.7.2.

We'd strongly prefer the stretchy construction. Do you have any objections to us fixing it here and then you can pull it back your way?

[physikerwelt]

@pkra no. It seems to be all right. We are not bound to a particular MathJax version, so even if there was a bug we could still postpone the update to the new MathJax version until the bug was fixed.

[pkra]

Thanks, @physikerwelt.

@dvpc will you make an alternative PR and close this?

[dpvc]

@pkra, will do.

[pkra]

Thanks!

[pkra]

@dpvc cf also https://phabricator.wikimedia.org/T137787

[dpvc]

I have made PR #1810 that includes the definitions that handle scaling for displaystyle, and also adds the \dashint and \ddashint that Peter referenced. Let me know if this is acceptable. I'm closing this PR for now.