Use of mmultiscripts in SVG mode causes [Math Processing Error]

[dpvc]

In SVG output, any use of <mmultiscripts> that includes spacing before it leads to a Math Processing Error.

[dpvc]

This is because the this.SVGhandleSpace() call on line 32 of the SVG mmultiscripts.js file is missing the svg parameter. That is easily fixed.

[dpvc]

The issue294 branch of my fork of MathJax resolves this issue.

[fred-wang]

The testsuite contains the following tests:

MathMLToDisplay/Presentation/CSS/mprescripts/*

=> skipped

MathMLToDisplay/ErrorHandling/NumChildren/noChildPresentation.html

=> [Math Processing Error] intentional and ignored.

MathMLToDisplay/Presentation/ScriptsAndLimits/mmultiscripts/mmultiscripts-1-1a.html
MathMLToDisplay/Presentation/ScriptsAndLimits/mmultiscripts/mmultiscripts-1-1b.html
MathMLToDisplay/Presentation/ScriptsAndLimits/mmultiscripts/mmultiscripts-1-1c.html
MathMLToDisplay/Presentation/ScriptsAndLimits/mmultiscripts/mmultiscripts-1-1d.html

=> Apparently testing only one script at once.

MathMLToDisplay/Presentation/GeneralLayout/mstyle/mstyle-1-7.html

=> Testing four scripts + inheritance of subscriptshift/superscriptshift

None of them seem to detect this issue. From your comment on the fix, spacing must be involved and from the test case mentioned on the mailing list, a minimal testcase seems to be

<mmultiscripts>
  <mi>x</mi>
  <none/>
  <none/>
</mmultiscripts>
<mo>+</mo>
<mmultiscripts>
  <mi>x</mi>
  <none/>
  <none/>
</mmultiscripts>

[fred-wang]

Load test will be

MathMLToDisplay/Presentation/ScriptsAndLimits/mmultiscripts/issue294.html

Fix verified with Opera, Chrome and Firefox.

=> In testsuite, Ready for review

[dpvc]

You are right, it does require there to be spacing. In your test case, only the second mmultiscripts is needed; the first could just be <mi>x</mi>, but it is also fine as is. I've updated the statement of the issue.

[fred-wang]

OK, I tried to replace the second one by an <mi> but didn't try on the first one. I'll update the test.

[dpvc]

Right, the spacing between two elements is added on the left of the second of the pair, which is why you need the second one, not the first.