Metadata templates: onedit trigger

[Edvs]

The intention would be that we have the ability to specify in preferences/"Metadata templates" per template a tag which automatically activates that template when the value of that tag was changed in the metadata panel.

We could for example create a metadata template that copies the tag "XMP Dublin Core\Description" to another XMP tag (which is used in other software).  In that metadata template we specify that "XMP Dublin Core\Description" is the onedit trigger.

If I now change the value of XMP Dublin Core\Description of a specific image in the metadata panel the metadata template gets activated and copies the value I entered to the xmp tag i specified in the template.