* feat: \nonumber and \notag support
Support `\nonumber` (and equivalent `\notag`) using a global macro
`\@eqnsw` to track whether one occurs in each row, similar to how
amsmath uses global `\@eqnswtrue`/`\@eqnswfalse`.
Fix#2950
* Remove duplicate mention of align*
* Working version of \tag within {align}
* Simpler subparse mechanism
* Fix flow errors, clarifying set-to-undefined
* Document that \tag works in rows
* Add screenshot tests
* Add Jest tests
* Add Safari screenshot
* Commit message about fixing \tag
Fixes#2379
* Apply suggestions from code review
Co-authored-by: ylemkimon <y@ylem.kim>
* Revise and move getAutoTag
* Fix handling of split
* Remove unnecessary feedTokens
Co-authored-by: ylemkimon <y@ylem.kim>
Co-authored-by: ylemkimon <y@ylem.kim>