Currently and still when I drag n drop a item from Win Explorer/file manager folder into XnView MP's 'Browser' folder of my choice, the item is just 'copied' over rather than actually moved and I dislike this process especially for larger image files that I folder manipulate. Heck I think that this is bad behaviour for any file/folder being moved in and out of XnView's 'Browser'
Even the old and existing XnView win did this same thing too in it's 'Browser' but I never really used XnView win's 'browser' back then lol

I think by DEFAULT that this should be DISABLED however an option enable this if wanted (enable/disable) tickbox can be made for users that like the feature.