Fix event handler's field 'Current document properties have changed' when using properties of 'file' schema

When using any properties of schema file in field Current document properties have changed in the definition of an event handler, the automation script or chain does not get triggered.

Event handler's definition

• Events: {{Before document modification
• Current document properties have changed*: add property content/data of schema file

Required fix is to be able to select file:content whereas only subfields of "file:content" are available.

Workaround

Custom EL expression field:

Document.doc.getProperty("file:content").dirty && Document.doc.getAdapter(org.nuxeo.ecm.core.api.blobholder.BlobHolder).blob != null