With several photos selected, the Info panel offers Show Metadata For:
Target Photo (the default) shows the active photo's values as before,
and Selected Photos shows the values the selected photos share. A text
field or GPS where they differ is empty with a Mixed hint, and
Copyright Status shows Mixed. What is typed there is saved to every selected
photo, and a Mixed field typed in and left empty clears it on all of
them. A field left as it was saves nothing, even when the choice
changes during the edit. The choice is saved with the app settings, and
`view.infoSelectedPhotos {on?}` sets it for an agent.
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