nvda

8efed37b - AdobeAcrobat: support custom Microsoft Office mathml attribute. (#18056)

AdobeAcrobat: support custom Microsoft Office mathml attribute. (#18056) Blocked by #17984 Summary of the issue: In #17276, NVDA now treats the value of formular nodes in Adobe Acrobat as mathml, with out any real validation. In PDF 2.0 documents, this is no doubt an okay assumption, but for PDF 1.7 documents generated by Microsoft Word, this is now causing Microsoft word generated math speech alternative text to be processed by mathCAT, resulting in broken or junk navigation, as Microsoft Word is exposing its math speech text as the value of the node. However, at the same time Microsoft has also introduced a new custom mathml attribute it is exposing on formula nodes in PDFs generated from Microsoft Word, that contains real mathMl which is suitable for MathCAT. NVDA should make use of this new custom attribute if it exists. Description of user facing changes In Adobe Acrobat, NVDA can now read and interact with Math equations in PDF documents generated by Microsoft word. Description of development approach AcrobatNode NVDAObject's mathml property: first try and fetch Microsoft Office's custom mathMl custom attribute if it exists. Otherwise fallback to using the node's value or descendants.