1789983 - Automatic spacing not applied for <math> tag with a single operator

Status: NEW

(Core :: MathML, defect)

Description

[Frédéric Wang (:fredw)]

Attachment: Testcase

See attached test case. Specifying no space or large space with lspace/rspace attributes work as expected. However, the automatic spacing of "*" does not apply when the <math> contains only a single child which is an (embellished) operator.

Note that the MathML Core spec is clear the spacing should always apply for the <math>:

"Set add-space to true if the box corresponds to a <math> element or is not an embellished operator; and to false otherwise."

Chromium and WebKit properly adds the automatic spacing in this testcase.

I tried adding a simple GetParent()->>GetContent()->NodeInfo()->NameAtom() == nsGkAtoms::math here:

https://searchfox.org/mozilla-central/rev/31368c7795f44b7a15531d6c5e52dc97f82cf2d5/layout/mathml/nsMathMLContainerFrame.cpp#392

But that does not work. Probably there is something more involved, since it is only failing when lspace/rspace are not explicitly specified.

Comment 1

[Frédéric Wang (:fredw)]

Attachment: Screenshot in firefox

Here is a screenshot in Firefox. Note that automatic spacing is zero in the first case, but properly computed from the dictionary in the later case.