Steps to re-create scenario 1:
- open a Contact Sheet with no images selected
- right-click on any image and select "Add to Collection: ..." (any collection)
- image will not be added
Image will only be added if it is first selected.
Steps to re-create scenario 2:
- open a Contact Sheet and select any single image
- right-cllick on any other image and select "Add to Collection: ..." (any collection)
- the selected image will be added to the Collection, not the image right-clicked on
