Switch makeGlue from .mord .rule to .mspace

[edemaine]

Fix #1289

I haven't run screenshot tests yet; I'm curious to see whether this messes with anything.

[codecov]

Codecov Report

Merging #1295 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1295   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files          61       61           
  Lines        3978     3978           
  Branches      661      661           
=======================================
  Hits         3337     3337           
  Misses        543      543           
  Partials       98       98

Impacted Files	Coverage Δ
src/buildCommon.js	90.41% <100%> (ø)	⬆️

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[edemaine]

Amazingly, only two screenshots were affected. Here's the diff:

StrikeThrough:

StrikeThroughColor:

The result of this PR is in green/yellow, with more spaces. Somewhat easier to see in the Github diff. I think this shows that the change fixes some spacing bugs, properly treating the + as a binary operator. One example of the LaTeX source code is \bcancel 5 +\bcancel{5ay}.

[ronkok]

Yay! That solves a mystery. I couldn't figure out why \cancel wasn't working when adjacent to "+". So this addresses, at least in part, issue #1080.

[kevinbarabash]

@edemaine could you post diff images between the new render and the LaTeX rendering?

[kevinbarabash]

I'm glad that this didn't change much and ended up improving things a bit in the places it did change.

[edemaine]

I posted it on #1080 where you can compare to the old diff. I'm afraid it's not much better... but hopefully a step in the right direction.