Ron Kok 7b7b532fb6 Adjust \underset alignment and spacing (#1290) ...

* Support Unicode \ll and \lll

Fixes issue #1271

* Adjust \underset alignment and spacing

Fixes issue #1288.

1.  Fixes vertical alignment by keeping the base element on the baseline.
2. Assigns horizontal spacing to \underset in a manner that aligns with LaTeX `\binrel`

* Fix flow error

* Add comment

* Allow for shift of mathops

* Update screenshots

* Test for nested ordgroups

* Set \stackrel spacing class to mrel

* Fix lint error

* Better determination of atom type

* Add comment.

* Add `suppressBaseShift` to ParseNodeTypes

2018-05-10 13:13:37 +09:00

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