* Line breaks for inline formulas
* Basic support for \allowbreak and \nobreak
* Fix spacing around \nobreak, and add documentation
* Backwards-compatibility _getBuilt to fix tests
* Put operator spacing on same line as operator
* One approach to ~
* Simplify \allowbreak/\nobreak, make ~/\nobreakspace prevent line breaks
* Adapt to #1295
* Prevent wrapping within a .base
* Implement \hspace* properly
* Fix flow error
* Update comment for regularSpace
* Update screenshots
* Move `width: min-content` from .katex into .base
* Fix screenshot
* Add min-width rule to .vlist-s
* Factor out hasClass method
* Cleanup nobreak test
* Pull out buildHTMLUnbreakable
* Fix \hspace* test (no longer the same as \hspace)
* Fix \nobreak handling
* Add screenshot test
* Work around negative space bug in Chrome
Fix#984
The screenshot test is still somewhat defective, showing a space before
the "post" text (a period). This seems limited to the screenshotter, however,
as it works fine in the tester via
http://localhost:7936/?text=%5Cfbox%7B%5C%241%2C%5C!000%2C%5C!000%7D%5CKaTeX&display=0&after=.
* Update screenshots
* Switch to inherited `width: min-content`
