BlackFoundry

found it: https://github.com/adobe-type-tools/afdko/blob/spec-featurevar-syntax/docs/OpenTypeFeatureFileSpecification.md#4ei1-conditionset

need ask the design-team if still relevant

Read FontInfos to show various alignement lines and zones. Question of variations across the design-space…

yes but we need xheight, descender, and cap-height, etc.

Related to #907

> Before we can even start this, Fontra needs to grow more multi-user awareness at the client level. How advanced is the multi-user awarness of Fontra at the client level...

what about simply stopping the side bars expansion a bit before they reach half of the window size? (and keep the relation when the window is being resized horizontally)