Still a few white spaces presumably coming from Sage code

[kcrisman]

See #1027 for background. This still occurs in certain difficult-to-pinpoint circumstances, though always after Sage code, and always (to my knowledge) only visible using xelatex, not pdflatex. This ticket is for tracking such reports - and, eventually, any solution that comes about. Please add reports in comments, with more information or pointers to code when possible.

[kcrisman]

• Saw example of this with Sage code in the midst of two white spaces. White space crossed a subsection boundary and began immediately after an example and ended at the beginning of a fact.

[kcrisman]

• Saw example of this on the page after some Sage code, in the midst of an exercises section - where the only missing wording was the text of the introduction to an exercisegroup. The exercises themselves remained.