Fix inline linebreaking issues with SVG output. (mathjax/MathJax#3526)

[dpvc]

This PR fixes several issues with SVG output for inline expressions when automatic in-line breaks are enabled.

• First, inline breaks were being forced even when they were not enabled. This is fixed by using the option setting in forceInlineBreaks in ts/output/svg.ts.
• When switching from allowed breaks to breaks not being allowed, some embellished operators continued to be marked with the forcebreak property. This is fixed in ts/output/common.ts by removing the property that was added to the core mo in line 628.
• Finally, the issue raised in SVG Renderer: Vertical misalignment of \rightleftarrows when used with \underset and \stackrel MathJax#3526 was due to the line break on the embellished operator being inserted in the wrong place. When the embellished operator had several embellished parents (i.e., the core is nested several layers deep), as in the nested \underset and \stackrel macros, the forced break was being made between these macros rather than before the first one. This is fixed in ts/output/svg/Wrapper.ts by checking that the parent element is not embellished before line breaking is performed for embellished operators.

Resolves issue mathjax/MathJax#3526.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.50%. Comparing base (0b872a1) to head (0f3663e).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
ts/output/svg/Wrapper.ts	0.00%	7 Missing ⚠️
ts/output/svg.ts	0.00%	5 Missing ⚠️
ts/output/common.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1436      +/-   ##
===========================================
- Coverage    86.51%   86.50%   -0.02%     
===========================================
  Files          340      340              
  Lines        86031    86044      +13     
  Branches      4834     4834              
===========================================
  Hits         74430    74430              
- Misses       11577    11590      +13     
  Partials        24       24              

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[zorkow]

works. lgtm.