This breaks our current theme since the value "middle" was accepted before, and IMO does not make sense with the values from any format setting (at least left and right do not make sense for verticalAlignment)
Yep, this is a known issue as reported by others. I apologize for the inconvenience -- we'll be pushing an update with the release of March's Desktop. (internal ref #1031111)
the actionButton object does not have the right properties for verticalAlignment. It refers to the same enum as horizontalAlignment
"alignment": { "type": "string", "enum": [ "left", "center", "right" ]
This breaks our current theme since the value "middle" was accepted before, and IMO does not make sense with the values from any format setting (at least left and right do not make sense for verticalAlignment)