Add support for IEEEeqnarrary(box) and other amsmath matrix environments.
Add support for IEEEeqnarrary(box) and other amsmath matrix environments.

BUG: 267217

sandsmark/kate,hlamer/kate,DickJ/kate,jfmcarreira/kate,hlamer/kate,cmacq2/kate,sandsmark/kate,sandsmark/kate,hlamer/kate,sandsmark/kate,DickJ/kate,jfmcarreira/kate,DickJ/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,jfmcarreira/kate,DickJ/kate,cmacq2/kate,cmacq2/kate,hlamer/kate