I was wondering if there could be an indicator of some sort that shows the difference between a field with multiple entries in it and a field with no entries in it when editing multiple files.
For instance, in this image:
the producer field in the selected files has different values for each track, but the editing window shows blank/no values.
In this image:
the producer field in the selected files is blank and the editing window shows blank/no values.
This can often be confusing/misleading if the field in question is not visible in the main view.
(Yes I know upfirst is misspelled, it was good for a chuckle so I left it that way.)