The method photo:addOrRemoveFromTargetCollection() adds or removes all selected photos from the target collection rather than just "photo". To reproduce in LR 15.1 / Mac OS 15.7.1:
1. Save these lines to the file "add-remove-bug.lua" in the Lightroom Scripts folder:
local catalog = import "LrApplication".activeCatalog ()
catalog:getTargetPhoto ():addOrRemoveFromTargetCollection ()
2. Restart LR.
3. In Library, select three or more photos.
4. Do Scripts > add-remove-bug. Observe that all selected photos are added to the current target collection (incorrect), rather than just the most-selected photo.
If the developers consider the current behavior "as designed" (which would be very weird), then the documentation should be corrected to explain that behavior clearly.
AdChoices